Bootstrap EDEN: Fase 0 (arquitetura) e Fase 1 (monorepo + infra)

Fase 0 — descoberta e arquitetura:
- Inventário do projeto, glossário de domínio, arquitetura com bounded
  contexts e topologia de containers, threat model inicial.
- 12 ADRs cobrindo modular monolith, topologia de containers (Postgres
  isolado + eden-core/parceiros/assinante em containers e portas
  distintos), auth/sessões, modelo de permissões, criptografia/segredos,
  contrato first-class, stock ledger, separação billing/finance/fiscal,
  outbox transacional, adapters SaperX e Focus NFe, e identidade
  compartilhada entre as 3 apps.
- 14 subagentes e 7 skills especializados por domínio em .claude/.
- Hooks de segurança (PreToolUse/PostToolUse/Stop) testados via pipe.

Fase 1 — plataforma (em andamento):
- Monorepo pnpm workspaces + Turborepo: apps/{api,worker,core-web,
  reseller-web,subscriber-web} + 9 packages compartilhados.
- apps/api: NestJS mínimo com /health/live e /health/ready (checando
  Postgres real via @eden/database).
- 3 frontends Vite + React + TypeScript + Tailwind, com o favicon
  oficial do EDEN.
- packages/database: migration baseline (node-pg-migrate) criando
  roles/role_permissions/applications/users/user_applications/sessions/
  audit_log — audit log append-only com hash-chain, testado ao vivo
  (UPDATE/DELETE bloqueados pelo trigger).
- compose.yaml implementando a topologia da ADR-0002, validada de ponta
  a ponta: os 6 containers sobem e ficam saudáveis com um único
  `docker compose up`.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

packages/database/src/index.ts

@@ -0,0 +1 @@
+export { query, withTransaction, closePool } from "./pool.js";

packages/database/src/pool.ts

@@ -0,0 +1,45 @@
+import { Pool, type PoolClient, type QueryResultRow } from "pg";
+
+let pool: Pool | undefined;
+
+function getPool(): Pool {
+  if (!pool) {
+    const connectionString = process.env.DATABASE_URL;
+    if (!connectionString) {
+      throw new Error("DATABASE_URL env var is required");
+    }
+    pool = new Pool({ connectionString });
+  }
+  return pool;
+}
+
+export async function query<T extends QueryResultRow = QueryResultRow>(
+  text: string,
+  params?: unknown[],
+) {
+  return getPool().query<T>(text, params);
+}
+
+export async function withTransaction<T>(
+  fn: (client: PoolClient) => Promise<T>,
+): Promise<T> {
+  const client = await getPool().connect();
+  try {
+    await client.query("BEGIN");
+    const result = await fn(client);
+    await client.query("COMMIT");
+    return result;
+  } catch (err) {
+    await client.query("ROLLBACK");
+    throw err;
+  } finally {
+    client.release();
+  }
+}
+
+export async function closePool(): Promise<void> {
+  if (pool) {
+    await pool.end();
+    pool = undefined;
+  }
+}