feat: implement Dialplan with structured editor and versioning

- dialplan_extensions table (tenant-scoped, RLS): structured editor per
  agente.md secao 43 -- context, condition field/expr, actions/anti-actions
  (JSON), continue, order, enabled. One condition per extension (deliberate
  simplification vs raw FreeSWITCH's multi-condition extensions).
- dialplan_versions table (tenant-scoped, RLS): generate/validate/version/
  activate flow (secao 44). Reactivating an older version IS the rollback
  mechanism -- no separate endpoint needed.
- apps/api/src/dialplan: extensions CRUD + versions/generate (builds XML,
  validates well-formedness with fast-xml-parser, saves as DRAFT) +
  versions/:id/activate (atomically flips ACTIVE, supersedes the previous
  one). Reused freeswitch.view/.configure permissions rather than inventing
  new ones not in the agente.md permission list.
- packages/telephony: buildDialplanXml() plus ALLOWED_DIALPLAN_APPLICATIONS,
  an explicit allowlist (answer/bridge/playback/hangup/set/export/... --
  deliberately no system/exec/socket) guarding against a tenant configuring
  a dialplan action that runs arbitrary commands on the FreeSWITCH host
  (agente.md secao 180)
- b2bcall-fs-config resolves dialplan dynamically per call (unlike Trunks'
  file+rescan approach -- dialplan is fetched fresh via mod_xml_curl on
  every call anyway) by tenant id from the variable_b2bcall_tenant_id
  channel variable already injected at directory resolution, then serving
  whichever DialplanVersion is ACTIVE for that context
- verified end-to-end: created a rule for destination_number 7000, generated
  and activated v1, originated a call that actually routed through the
  dialplan (not bypassing it via &app()) -- CALL_CREATED -> CALL_ANSWERED ->
  CALL_ENDED with the correct tenantId throughout. Created and activated a
  v2, then rolled back to v1 by reactivating it; status transitions
  (ACTIVE/SUPERSEDED) all confirmed via the API.

CRITICAL FINDING, fixed in this same phase: deliberately testing that the
application allowlist rejects 'system' got back 201 instead of 400 --
NestJS's ValidationPipe had been silently inert across all of apps/api's
@Body() DTOs since the API was first created. Root cause: running via
 (esbuild) instead of a real  build -- esbuild doesn't always
resolve cross-file parameter types for design:paramtypes metadata, and Nest
skips validation without any error when it can't determine the DTO class.
Fixed by always building with tsc before running (tsc && tsx dist/main.js
-- still via tsx because internal workspace packages aren't built to JS
yet). Re-verified with two deliberate bad-input tests post-fix, both
correctly rejected with 400. A stray malicious test row (dialplan action
'system') created while the bug was live was deleted; it was never baked
into an activated version, so nothing could have executed it.
See docs/VALIDATION_PIPE_BUG.md for the full writeup.

docs/DIALPLAN.md, docs/VALIDATION_PIPE_BUG.md, docs/EXTENSIONS.md updated

apps/api/src/app.module.ts

@@ -3,8 +3,9 @@ import { HealthModule } from "./health/health.module";
 import { AuthModule } from "./auth/auth.module";
 import { ExtensionsModule } from "./extensions/extensions.module";
 import { TrunksModule } from "./trunks/trunks.module";
+import { DialplanModule } from "./dialplan/dialplan.module";
 
 @Module({
-  imports: [HealthModule, AuthModule, ExtensionsModule, TrunksModule],
+  imports: [HealthModule, AuthModule, ExtensionsModule, TrunksModule, DialplanModule],
 })
 export class AppModule {}

apps/api/src/dialplan/dialplan-extensions.controller.ts

@@ -0,0 +1,97 @@
+import {
+  Body,
+  Controller,
+  Delete,
+  Get,
+  HttpCode,
+  HttpStatus,
+  NotFoundException,
+  Param,
+  Post,
+  Query,
+  UseGuards,
+} from "@nestjs/common";
+import { getPrismaClient, withTenantContext, type Prisma } from "@b2bcall/database";
+import { recordAuditEvent, type AccessTokenClaims } from "@b2bcall/auth";
+import { JwtAuthGuard } from "../common/guards/jwt-auth.guard";
+import { PermissionGuard } from "../common/guards/permission.guard";
+import { RequirePermission } from "../common/decorators/require-permission.decorator";
+import { CurrentUser } from "../common/decorators/current-user.decorator";
+import { CreateDialplanExtensionDto } from "./dto/create-dialplan-extension.dto";
+
+@UseGuards(JwtAuthGuard, PermissionGuard)
+@Controller("dialplan/extensions")
+export class DialplanExtensionsController {
+  @RequirePermission("freeswitch.configure")
+  @Post()
+  async create(@CurrentUser() user: AccessTokenClaims, @Body() dto: CreateDialplanExtensionDto) {
+    const prisma = getPrismaClient();
+    const tenantId = user.tenantId!;
+
+    const extension = await withTenantContext(prisma, tenantId, (tx) =>
+      tx.dialplanExtension.create({
+        data: {
+          tenantId,
+          context: dto.context ?? "default",
+          name: dto.name,
+          conditionField: dto.conditionField,
+          conditionExpr: dto.conditionExpr,
+          actions: dto.actions as unknown as Prisma.InputJsonValue,
+          antiActions: dto.antiActions as unknown as Prisma.InputJsonValue | undefined,
+          continueOnFalse: dto.continueOnFalse ?? false,
+          order: dto.order ?? 0,
+        },
+      }),
+    );
+
+    await recordAuditEvent(prisma, {
+      action: "DIALPLAN_EXTENSION_CREATE",
+      tenantId,
+      userId: user.sub,
+      entityType: "dialplan_extension",
+      entityId: extension.id,
+      after: { name: extension.name, context: extension.context },
+    });
+
+    return extension;
+  }
+
+  @RequirePermission("freeswitch.view")
+  @Get()
+  async list(@CurrentUser() user: AccessTokenClaims, @Query("context") context?: string) {
+    const prisma = getPrismaClient();
+    const tenantId = user.tenantId!;
+    return withTenantContext(prisma, tenantId, (tx) =>
+      tx.dialplanExtension.findMany({
+        where: { deletedAt: null, ...(context ? { context } : {}) },
+        orderBy: [{ context: "asc" }, { order: "asc" }],
+      }),
+    );
+  }
+
+  @RequirePermission("freeswitch.configure")
+  @Delete(":id")
+  @HttpCode(HttpStatus.NO_CONTENT)
+  async remove(@CurrentUser() user: AccessTokenClaims, @Param("id") id: string) {
+    const prisma = getPrismaClient();
+    const tenantId = user.tenantId!;
+
+    const result = await withTenantContext(prisma, tenantId, (tx) =>
+      tx.dialplanExtension.updateMany({
+        where: { id, deletedAt: null },
+        data: { deletedAt: new Date(), enabled: false },
+      }),
+    );
+    if (result.count === 0) {
+      throw new NotFoundException();
+    }
+
+    await recordAuditEvent(prisma, {
+      action: "DIALPLAN_EXTENSION_DELETE",
+      tenantId,
+      userId: user.sub,
+      entityType: "dialplan_extension",
+      entityId: id,
+    });
+  }
+}

apps/api/src/dialplan/dialplan-versions.controller.ts

@@ -0,0 +1,168 @@
+import {
+  BadRequestException,
+  Controller,
+  Get,
+  NotFoundException,
+  Param,
+  Post,
+  Query,
+  UseGuards,
+} from "@nestjs/common";
+import { XMLValidator } from "fast-xml-parser";
+import { getPrismaClient, withTenantContext } from "@b2bcall/database";
+import { recordAuditEvent, type AccessTokenClaims } from "@b2bcall/auth";
+import {
+  buildDialplanXml,
+  type AllowedConditionField,
+  type AllowedDialplanApplication,
+} from "@b2bcall/telephony";
+import { JwtAuthGuard } from "../common/guards/jwt-auth.guard";
+import { PermissionGuard } from "../common/guards/permission.guard";
+import { RequirePermission } from "../common/decorators/require-permission.decorator";
+import { CurrentUser } from "../common/decorators/current-user.decorator";
+
+@UseGuards(JwtAuthGuard, PermissionGuard)
+@Controller("dialplan/versions")
+export class DialplanVersionsController {
+  /**
+   * "Gerar" + "validar" (agente.md secao 44): monta o XML a partir das
+   * linhas atuais de dialplan_extensions pro context, valida
+   * bem-formação, salva como nova versão DRAFT (não afeta chamadas até
+   * ser ativada).
+   */
+  @RequirePermission("freeswitch.configure")
+  @Post("generate")
+  async generate(@CurrentUser() user: AccessTokenClaims, @Query("context") context = "default") {
+    const prisma = getPrismaClient();
+    const tenantId = user.tenantId!;
+
+    const extensions = await withTenantContext(prisma, tenantId, (tx) =>
+      tx.dialplanExtension.findMany({
+        where: { context, enabled: true, deletedAt: null },
+        orderBy: { order: "asc" },
+      }),
+    );
+
+    const xml = buildDialplanXml(
+      context,
+      extensions.map((e) => ({
+        name: e.name,
+        conditionField: e.conditionField as AllowedConditionField,
+        conditionExpr: e.conditionExpr,
+        actions: e.actions as unknown as { application: AllowedDialplanApplication; data?: string }[],
+        antiActions: e.antiActions as unknown as
+          | { application: AllowedDialplanApplication; data?: string }[]
+          | undefined,
+        continueOnFalse: e.continueOnFalse,
+        order: e.order,
+      })),
+    );
+
+    const validation = XMLValidator.validate(xml);
+    if (validation !== true) {
+      // Bug nosso (o XML é gerado por template escapado, nunca deveria
+      // acontecer) — melhor falhar alto do que salvar XML quebrado.
+      throw new BadRequestException(`XML gerado invalido: ${validation.err.msg}`);
+    }
+
+    const last = await withTenantContext(prisma, tenantId, (tx) =>
+      tx.dialplanVersion.findFirst({
+        where: { tenantId, context },
+        orderBy: { version: "desc" },
+      }),
+    );
+    const nextVersion = (last?.version ?? 0) + 1;
+
+    const version = await withTenantContext(prisma, tenantId, (tx) =>
+      tx.dialplanVersion.create({
+        data: {
+          tenantId,
+          context,
+          version: nextVersion,
+          generatedXml: xml,
+          status: "DRAFT",
+          createdByUserId: user.sub,
+        },
+      }),
+    );
+
+    await recordAuditEvent(prisma, {
+      action: "DIALPLAN_VERSION_GENERATE",
+      tenantId,
+      userId: user.sub,
+      entityType: "dialplan_version",
+      entityId: version.id,
+      after: { context, version: nextVersion, extensionCount: extensions.length },
+    });
+
+    return version;
+  }
+
+  @RequirePermission("freeswitch.view")
+  @Get()
+  async list(@CurrentUser() user: AccessTokenClaims, @Query("context") context?: string) {
+    const prisma = getPrismaClient();
+    const tenantId = user.tenantId!;
+    return withTenantContext(prisma, tenantId, (tx) =>
+      tx.dialplanVersion.findMany({
+        where: context ? { context } : {},
+        orderBy: [{ context: "asc" }, { version: "desc" }],
+        select: {
+          id: true,
+          context: true,
+          version: true,
+          status: true,
+          createdAt: true,
+          activatedAt: true,
+          createdByUserId: true,
+        },
+      }),
+    );
+  }
+
+  /**
+   * "Ativar" (secao 44). Reativar uma versão antiga É o rollback — não
+   * existe endpoint separado. Como o dialplan é resolvido por chamada via
+   * mod_xml_curl (não é config estática lida uma vez no boot), não precisa
+   * de reloadxml/rescan: a próxima chamada já enxerga a versão ativa.
+   */
+  @RequirePermission("freeswitch.configure")
+  @Post(":id/activate")
+  async activate(@CurrentUser() user: AccessTokenClaims, @Param("id") id: string) {
+    const prisma = getPrismaClient();
+    const tenantId = user.tenantId!;
+
+    const target = await withTenantContext(prisma, tenantId, (tx) =>
+      tx.dialplanVersion.findFirst({ where: { id, tenantId } }),
+    );
+    if (!target) {
+      throw new NotFoundException();
+    }
+
+    // Já roda dentro da transação de withTenantContext — as duas operações
+    // são atômicas sem precisar de um $transaction aninhado.
+    await withTenantContext(prisma, tenantId, async (tx) => {
+      await tx.dialplanVersion.updateMany({
+        where: { tenantId, context: target.context, status: "ACTIVE" },
+        data: { status: "SUPERSEDED" },
+      });
+      await tx.dialplanVersion.update({
+        where: { id: target.id },
+        data: { status: "ACTIVE", activatedAt: new Date() },
+      });
+    });
+
+    await recordAuditEvent(prisma, {
+      action: "DIALPLAN_VERSION_ACTIVATE",
+      tenantId,
+      userId: user.sub,
+      entityType: "dialplan_version",
+      entityId: target.id,
+      after: { context: target.context, version: target.version },
+    });
+
+    return withTenantContext(prisma, tenantId, (tx) =>
+      tx.dialplanVersion.findUniqueOrThrow({ where: { id: target.id } }),
+    );
+  }
+}

apps/api/src/dialplan/dialplan.module.ts

@@ -0,0 +1,8 @@
+import { Module } from "@nestjs/common";
+import { DialplanExtensionsController } from "./dialplan-extensions.controller";
+import { DialplanVersionsController } from "./dialplan-versions.controller";
+
+@Module({
+  controllers: [DialplanExtensionsController, DialplanVersionsController],
+})
+export class DialplanModule {}

apps/api/src/dialplan/dto/action.dto.ts

@@ -0,0 +1,12 @@
+import { IsIn, IsOptional, IsString, MaxLength } from "class-validator";
+import { ALLOWED_DIALPLAN_APPLICATIONS, type AllowedDialplanApplication } from "@b2bcall/telephony";
+
+export class ActionDto {
+  @IsIn(ALLOWED_DIALPLAN_APPLICATIONS)
+  application!: AllowedDialplanApplication;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
+  data?: string;
+}

apps/api/src/dialplan/dto/create-dialplan-extension.dto.ts

@@ -0,0 +1,55 @@
+import { Type } from "class-transformer";
+import {
+  ArrayMaxSize,
+  ArrayMinSize,
+  IsArray,
+  IsBoolean,
+  IsIn,
+  IsInt,
+  IsOptional,
+  IsString,
+  MaxLength,
+  ValidateNested,
+} from "class-validator";
+import { ALLOWED_CONDITION_FIELDS, type AllowedConditionField } from "@b2bcall/telephony";
+import { ActionDto } from "./action.dto";
+
+export class CreateDialplanExtensionDto {
+  @IsOptional()
+  @IsString()
+  @MaxLength(80)
+  context?: string;
+
+  @IsString()
+  @MaxLength(120)
+  name!: string;
+
+  @IsIn(ALLOWED_CONDITION_FIELDS)
+  conditionField!: AllowedConditionField;
+
+  @IsString()
+  @MaxLength(255)
+  conditionExpr!: string;
+
+  @IsArray()
+  @ArrayMinSize(1)
+  @ArrayMaxSize(20)
+  @ValidateNested({ each: true })
+  @Type(() => ActionDto)
+  actions!: ActionDto[];
+
+  @IsOptional()
+  @IsArray()
+  @ArrayMaxSize(20)
+  @ValidateNested({ each: true })
+  @Type(() => ActionDto)
+  antiActions?: ActionDto[];
+
+  @IsOptional()
+  @IsBoolean()
+  continueOnFalse?: boolean;
+
+  @IsOptional()
+  @IsInt()
+  order?: number;
+}