feat(ai): provider layer — abstracao, OpenAI/Anthropic, global+BYOK

Fecha agente.md secao 95-103. Primeira peca do modulo de IA — a
abstracao de provider, os adapters OpenAI/Anthropic, capabilities, e o
cadastro de providers/modelos (global + BYOK). O pipeline que aciona
isso depois de uma chamada terminar (transcricao, analise, jobs
assincronos, prompts, scorecards, usage metering — secao 104-124) fica
pra proxima fase.

## Schema completo do modulo de IA numa unica migration

Todas as tabelas das secoes 95-124 de uma vez (ai_providers/ai_models/
ai_prompt_templates+versions/ai_jobs/call_transcriptions+segments/
call_ai_analyses/quality_scorecards+items+evaluations/ai_usage_records) —
mais barato revisar o desenho relacional inteiro numa unica passada do
que fatiar em migrations pequenas que se emendam. O codigo que usa essas
tabelas vem em fases separadas, so' Provider/Model nesta.

## packages/ai

Interface AIProvider (secao 96: nunca hardcoda OpenAI no dominio).
OpenAIProvider/AnthropicProvider (secao 97-98, nomenclatura "OpenAI API"/
"Anthropic API", nunca "ChatGPT") via fetch nativo direto contra cada API
— sem SDK oficial, request/response inteiramente visivel no proprio
codigo (relevante ja' que manda dado de cliente pra fora, secao 122-123).
transcribe so' na OpenAI (Anthropic nao tem endpoint de audio, secao 102:
"nem todo provider tem todas as capacidades"); analyze/structuredGenerate
via Structured Outputs na OpenAI e "tool use" forcado na Anthropic.
SensitiveDataRedactor (secao 123): CPF/CNPJ/telefone/email/cartao.

**Nunca exercitados contra rede real** — esta sessao so' tem autorizacao
de rede pro servidor git (restricao definida desde o primeiro pedido do
usuario). Mesmo padrao de honestidade ja' usado pro S3ObjectStorageProvider
e o caminho PSTN real.

## ai_providers/ai_models — global vs. BYOK

scope=GLOBAL (platform admin, tenant_id null) visivel de qualquer tenant;
scope=TENANT (BYOK) so' do dono. RLS hibrida (tenant_id = current OR
tenant_id IS NULL, mesma tecnica de tenant_memberships no login); quem
pode ESCREVER num GLOBAL e' decidido na camada de servico
(isPlatformUser), nao pela RLS. Key nunca reexposta (so' apiKeyPreview).

## Dois bugs reais achados testando esta fase

- Delete de provider fazia hard delete, bloqueado por FK quando um
  AIModel (mesmo soft-deleted) ainda referenciava — inconsistente com o
  resto do sistema (tudo soft delete). Corrigido; GET /ai/providers
  tambem nao filtrava desabilitados, corrigido junto.
- SensitiveDataRedactor: \b antes de \(? opcional falha quando o char
  anterior tambem nao e' de palavra (espaco + "("), vazando um parenteses
  solto (nenhum dado sensivel de verdade vazava). Corrigido com (?<!\w).

Verificado ponta a ponta com 2 tenants + platform admin: GLOBAL so'
platform admin cria/apaga, BYOK isolado por RLS (tenant B nunca ve' BYOK
do tenant A, 404 em id direto), modelo de provider GLOBAL visivel dos
dois tenants, redactor com 5 tipos de dado sensivel todos corretos.

typecheck do workspace inteiro limpo.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01X1HxY46WGU4G1zmVDNKcWw

apps/api/package.json

@@ -9,6 +9,7 @@
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
+    "@b2bcall/ai": "workspace:*",
     "@b2bcall/auth": "workspace:*",
     "@b2bcall/database": "workspace:*",
     "@b2bcall/entitlements": "workspace:*",

apps/api/src/ai/ai-models.controller.ts

@@ -0,0 +1,83 @@
+import { Body, Controller, Delete, Get, HttpCode, HttpStatus, NotFoundException, Post, Param, 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 { CreateAIModelDto } from "./dto/create-ai-model.dto";
+
+/** "ai_models" (agente.md secao 102-103) — modelos configuráveis por
+ * provider, cada um com seu conjunto de capabilities e custos. */
+@UseGuards(JwtAuthGuard, PermissionGuard)
+@Controller("ai/models")
+export class AIModelsController {
+  @RequirePermission("ai.manage")
+  @Post()
+  async create(@CurrentUser() user: AccessTokenClaims, @Body() dto: CreateAIModelDto) {
+    const prisma = getPrismaClient();
+    const tenantId = user.tenantId!;
+
+    const provider = await withTenantContext(prisma, tenantId, (tx) =>
+      tx.aIProvider.findFirst({ where: { id: dto.providerId } }),
+    );
+    if (!provider) throw new NotFoundException("Provider nao encontrado");
+
+    const model = await withTenantContext(prisma, tenantId, (tx) =>
+      tx.aIModel.create({
+        data: {
+          tenantId: provider.tenantId,
+          providerId: provider.id,
+          externalModelId: dto.externalModelId,
+          displayName: dto.displayName,
+          capabilities: (dto.capabilities ?? []) as Prisma.AIModelCreateInput["capabilities"],
+          inputCost: dto.inputCost,
+          outputCost: dto.outputCost,
+          audioCost: dto.audioCost,
+        },
+      }),
+    );
+
+    await recordAuditEvent(prisma, {
+      action: "AI_MODEL_CREATE",
+      tenantId: provider.tenantId,
+      userId: user.sub,
+      entityType: "ai_model",
+      entityId: model.id,
+      after: { displayName: model.displayName, externalModelId: model.externalModelId },
+    });
+
+    return model;
+  }
+
+  @RequirePermission("ai.view")
+  @Get()
+  async list(@CurrentUser() user: AccessTokenClaims) {
+    const prisma = getPrismaClient();
+    const tenantId = user.tenantId!;
+    return withTenantContext(prisma, tenantId, (tx) =>
+      tx.aIModel.findMany({ where: { enabled: true }, orderBy: { displayName: "asc" } }),
+    );
+  }
+
+  @RequirePermission("ai.manage")
+  @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.aIModel.updateMany({ where: { id }, data: { enabled: false } }),
+    );
+    if (result.count === 0) throw new NotFoundException();
+
+    await recordAuditEvent(prisma, {
+      action: "AI_MODEL_DELETE",
+      tenantId,
+      userId: user.sub,
+      entityType: "ai_model",
+      entityId: id,
+    });
+  }
+}

apps/api/src/ai/ai-providers.controller.ts

@@ -0,0 +1,136 @@
+import {
+  Body,
+  Controller,
+  Delete,
+  ForbiddenException,
+  Get,
+  HttpCode,
+  HttpStatus,
+  NotFoundException,
+  Param,
+  Post,
+  UseGuards,
+} from "@nestjs/common";
+import { getPrismaClient, withTenantContext, type AIProvider } from "@b2bcall/database";
+import { encryptSecret } from "@b2bcall/shared";
+import { recordAuditEvent, isPlatformUser, type AccessTokenClaims } from "@b2bcall/auth";
+import { SUPPORTED_PROVIDER_TYPES } from "@b2bcall/ai";
+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 { CreateAIProviderDto } from "./dto/create-ai-provider.dto";
+
+// Nunca reexpõe encryptedApiKey (agente.md secao 101: "nunca mostrar key
+// inteira após salvar") — só um preview dos últimos 4 caracteres, o
+// suficiente pra reconhecer qual key é sem nunca vazar a key completa de
+// volta pro client.
+function serializeProvider(provider: AIProvider) {
+  const { encryptedApiKey: _encryptedApiKey, ...rest } = provider;
+  return { ...rest, apiKeyPreview: `...${provider.encryptedApiKey.slice(-8)}` };
+}
+
+/**
+ * Providers de IA (agente.md secao 96-101). `scope=GLOBAL` (cadastrado
+ * pelo platform admin, visível de qualquer tenant — secao 100) só pode ser
+ * criado/apagado por quem tem role PLATFORM; `scope=TENANT` (BYOK) é livre
+ * pra qualquer tenant admin gerenciar só o próprio.
+ */
+@UseGuards(JwtAuthGuard, PermissionGuard)
+@Controller("ai/providers")
+export class AIProvidersController {
+  @RequirePermission("ai.manage")
+  @Post()
+  async create(@CurrentUser() user: AccessTokenClaims, @Body() dto: CreateAIProviderDto) {
+    const prisma = getPrismaClient();
+    const tenantId = user.tenantId!;
+
+    if (dto.scope === "GLOBAL") {
+      const isPlatform = await isPlatformUser(user.sub);
+      if (!isPlatform) {
+        throw new ForbiddenException("So' um usuario com role de plataforma pode cadastrar um provider GLOBAL");
+      }
+    }
+    if (!SUPPORTED_PROVIDER_TYPES.includes(dto.providerType)) {
+      throw new ForbiddenException(
+        `providerType nao suportado: ${dto.providerType} (suportados: ${SUPPORTED_PROVIDER_TYPES.join(", ")})`,
+      );
+    }
+
+    const provider = await withTenantContext(prisma, tenantId, (tx) =>
+      tx.aIProvider.create({
+        data: {
+          scope: dto.scope,
+          tenantId: dto.scope === "GLOBAL" ? null : tenantId,
+          providerType: dto.providerType,
+          name: dto.name,
+          baseUrl: dto.baseUrl,
+          encryptedApiKey: encryptSecret(dto.apiKey),
+          organization: dto.organization,
+          project: dto.project,
+        },
+      }),
+    );
+
+    await recordAuditEvent(prisma, {
+      action: "AI_PROVIDER_CREATE",
+      tenantId: dto.scope === "GLOBAL" ? null : tenantId,
+      userId: user.sub,
+      entityType: "ai_provider",
+      entityId: provider.id,
+      after: { providerType: provider.providerType, name: provider.name, scope: provider.scope },
+    });
+
+    return serializeProvider(provider);
+  }
+
+  /** Global (visível de qualquer tenant) + BYOK do próprio tenant — a
+   * própria RLS híbrida já resolve essa união, sem WHERE extra aqui. */
+  @RequirePermission("ai.view")
+  @Get()
+  async list(@CurrentUser() user: AccessTokenClaims) {
+    const prisma = getPrismaClient();
+    const tenantId = user.tenantId!;
+    const providers = await withTenantContext(prisma, tenantId, (tx) =>
+      tx.aIProvider.findMany({ where: { enabled: true }, orderBy: { name: "asc" } }),
+    );
+    return providers.map(serializeProvider);
+  }
+
+  @RequirePermission("ai.manage")
+  @Delete(":id")
+  @HttpCode(HttpStatus.NO_CONTENT)
+  async remove(@CurrentUser() user: AccessTokenClaims, @Param("id") id: string) {
+    const prisma = getPrismaClient();
+    const tenantId = user.tenantId!;
+
+    const provider = await withTenantContext(prisma, tenantId, (tx) => tx.aIProvider.findFirst({ where: { id } }));
+    if (!provider) throw new NotFoundException();
+
+    if (provider.scope === "GLOBAL") {
+      const isPlatform = await isPlatformUser(user.sub);
+      if (!isPlatform) {
+        throw new ForbiddenException("So' um usuario com role de plataforma pode apagar um provider GLOBAL");
+      }
+    } else if (provider.tenantId !== tenantId) {
+      // Nunca deveria acontecer (RLS ja' filtra), mas nunca custa checar
+      // explicitamente antes de uma escrita (secao 31/146).
+      throw new NotFoundException();
+    }
+
+    // Soft delete (mesmo padrão de Disposition/PauseReason/etc.) — nunca
+    // hard delete: um AIModel ainda pode referenciar este provider (FK
+    // RESTRICT), e o histórico de CallTranscription/CallAIAnalysis que já
+    // usou este provider precisa continuar apontando pra um provider_id
+    // válido mesmo depois de desativado.
+    await withTenantContext(prisma, tenantId, (tx) => tx.aIProvider.update({ where: { id }, data: { enabled: false } }));
+
+    await recordAuditEvent(prisma, {
+      action: "AI_PROVIDER_DELETE",
+      tenantId: provider.scope === "GLOBAL" ? null : tenantId,
+      userId: user.sub,
+      entityType: "ai_provider",
+      entityId: id,
+    });
+  }
+}

apps/api/src/ai/ai.module.ts

@@ -0,0 +1,8 @@
+import { Module } from "@nestjs/common";
+import { AIProvidersController } from "./ai-providers.controller";
+import { AIModelsController } from "./ai-models.controller";
+
+@Module({
+  controllers: [AIProvidersController, AIModelsController],
+})
+export class AIModule {}

apps/api/src/ai/dto/create-ai-model.dto.ts

@@ -0,0 +1,33 @@
+import { IsArray, IsIn, IsNumber, IsOptional, IsString, IsUUID, MaxLength } from "class-validator";
+
+const CAPABILITIES = ["TRANSCRIPTION", "DIARIZATION", "TEXT_ANALYSIS", "STRUCTURED_OUTPUT", "EMBEDDINGS", "REALTIME_AUDIO"];
+
+export class CreateAIModelDto {
+  @IsUUID()
+  providerId!: string;
+
+  @IsString()
+  @MaxLength(120)
+  externalModelId!: string;
+
+  @IsString()
+  @MaxLength(120)
+  displayName!: string;
+
+  @IsOptional()
+  @IsArray()
+  @IsIn(CAPABILITIES, { each: true })
+  capabilities?: string[];
+
+  @IsOptional()
+  @IsNumber()
+  inputCost?: number;
+
+  @IsOptional()
+  @IsNumber()
+  outputCost?: number;
+
+  @IsOptional()
+  @IsNumber()
+  audioCost?: number;
+}

apps/api/src/ai/dto/create-ai-provider.dto.ts

@@ -0,0 +1,34 @@
+import { IsIn, IsOptional, IsString, MaxLength, MinLength } from "class-validator";
+
+export class CreateAIProviderDto {
+  @IsIn(["GLOBAL", "TENANT"])
+  scope!: "GLOBAL" | "TENANT";
+
+  @IsString()
+  @MaxLength(80)
+  providerType!: string;
+
+  @IsString()
+  @MaxLength(120)
+  name!: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(255)
+  baseUrl?: string;
+
+  @IsString()
+  @MinLength(10)
+  @MaxLength(500)
+  apiKey!: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(120)
+  organization?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(120)
+  project?: string;
+}

apps/api/src/app.module.ts

@@ -15,6 +15,7 @@ import { DispositionsModule } from "./dispositions/dispositions.module";
 import { CallsModule } from "./calls/calls.module";
 import { ReportsModule } from "./reports/reports.module";
 import { RecordingsModule } from "./recordings/recordings.module";
+import { AIModule } from "./ai/ai.module";
 
 @Module({
   imports: [
@@ -34,6 +35,7 @@ import { RecordingsModule } from "./recordings/recordings.module";
     CallsModule,
     ReportsModule,
     RecordingsModule,
+    AIModule,
   ],
 })
 export class AppModule {}