feat: add typescript monorepo with pnpm workspaces and prisma database package

- root package.json + pnpm-workspace.yaml + tsconfig.base.json
- packages/types: canonical enums (TenantStatus, AgentState)
- packages/shared: re-exports types, base for future utilities
- packages/database: Prisma 7 schema with driver adapter (pg), initial
  tenants table matching agente.md section 29, first migration applied

packages/database/prisma/migrations/20260828022204_init/migration.sql

@@ -0,0 +1,28 @@
+-- CreateEnum
+CREATE TYPE "tenant_status" AS ENUM ('TRIAL', 'ACTIVE', 'SUSPENDED', 'PAST_DUE', 'CANCELLED');
+
+-- CreateTable
+CREATE TABLE "tenants" (
+    "id" UUID NOT NULL,
+    "code" TEXT NOT NULL,
+    "slug" TEXT NOT NULL,
+    "legal_name" TEXT NOT NULL,
+    "trade_name" TEXT,
+    "tax_id" TEXT,
+    "status" "tenant_status" NOT NULL DEFAULT 'TRIAL',
+    "timezone" TEXT NOT NULL DEFAULT 'America/Sao_Paulo',
+    "locale" TEXT NOT NULL DEFAULT 'pt-BR',
+    "billing_currency" TEXT NOT NULL DEFAULT 'BRL',
+    "telephony_domain" TEXT,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" TIMESTAMP(3) NOT NULL,
+    "deleted_at" TIMESTAMP(3),
+
+    CONSTRAINT "tenants_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "tenants_code_key" ON "tenants"("code");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "tenants_slug_key" ON "tenants"("slug");

packages/database/prisma/migrations/migration_lock.toml

@@ -0,0 +1,3 @@
+# Please do not edit this file manually
+# It should be added in your version-control system (e.g., Git)
+provider = "postgresql"