feat: add authentication and RBAC

- packages/database: schema Prisma (users/sessions/roles/permissions/
  user_roles/role_permissions/audit_logs/password_reset_tokens), migration
  inicial e seed (permissoes+perfis+bootstrap super_admin com senha
  aleatoria em FIRST_LOGIN.txt). Decisao de ORM (Prisma) documentada em
  docs/ARCHITECTURE.md
- packages/shared: catalogo de permissoes (fonte unica usada por seed e API)
- apps/api: NestJS 11 + Fastify
  - autenticacao: Argon2id, access JWT + refresh token opaco com rotacao,
    cookies HttpOnly/SameSite=Lax, change/forgot/reset password
  - rate limiting progressivo de login via Redis (bloqueio crescente por IP)
  - RBAC reforcado no backend (PermissionsGuard), protecao contra
    auto-elevacao de privilegio
  - auditoria (audit_logs) nas acoes sensiveis, com redacao de segredos
  - health checks reais (postgres+redis), swagger desabilitavel, logs
    estruturados JSON com request_id de correlacao, filtro global de
    excecoes sem vazar erro cru
- infrastructure/docker/api.Dockerfile: build multi-stage do monorepo pnpm
- docker-compose.yml: servico api na rede interna, sem porta publicada

Testado via containers reais: login, /me, refresh, change-password,
rate limit (7 tentativas -> 429), RBAC (nega/permite), bloqueio de
auto-elevacao (403), audit log populado, health checks, lint e testes
unitarios passando.

infrastructure/docker/api.Dockerfile

@@ -0,0 +1,40 @@
+# apps/api — NestJS (Fastify), monorepo pnpm.
+FROM node:24-slim AS build
+
+# Prisma precisa do OpenSSL para detectar corretamente o engine binário a
+# baixar — a imagem "slim" não vem com ele.
+RUN apt-get update && apt-get install -y --no-install-recommends openssl ca-certificates && rm -rf /var/lib/apt/lists/*
+RUN corepack enable && corepack prepare pnpm@11.24.0 --activate
+WORKDIR /app
+
+# Copia primeiro só os manifests para aproveitar cache de layer no `pnpm
+# install` — reinstalar tudo só quando dependências mudam, não a cada
+# alteração de código-fonte.
+COPY package.json pnpm-workspace.yaml pnpm-lock.yaml ./
+COPY apps/api/package.json apps/api/package.json
+COPY packages/database/package.json packages/database/package.json
+COPY packages/shared/package.json packages/shared/package.json
+
+RUN pnpm install --frozen-lockfile
+
+COPY packages/shared packages/shared
+COPY packages/database packages/database
+COPY apps/api apps/api
+
+RUN pnpm --filter @b2bcall/shared build \
+    && pnpm --filter @b2bcall/database build \
+    && pnpm --filter @b2bcall/api build
+
+# --- runtime -------------------------------------------------------------
+FROM node:24-slim AS runtime
+ENV NODE_ENV=production
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends openssl ca-certificates && rm -rf /var/lib/apt/lists/* \
+    && groupadd -r b2bcall && useradd -r -g b2bcall b2bcall
+
+COPY --from=build /app /app
+USER b2bcall
+
+EXPOSE 3000
+CMD ["node", "apps/api/dist/main.js"]