Phase 3.4: backend self-managed auth cutover

All backend auth now goes through our own token service — Firebase Auth
dependency is fully removed from auth paths. FCM (firebase-admin messaging)
is still used for push.

Schema:
- auth_sessions (multi-device refresh tokens, bcrypt-hashed)
- otp_requests (Fazpass reference + rate-limit history)
- customers.email + google_sub + apple_sub (social identity)
- control_center_users.password_hash + failed_login_count + lockout_until
- firebase_uid columns made nullable (drop in later cleanup migration)
- 6 new app_config keys for OTP + CC lockout tuning

Services:
- password.service.js — bcrypt cost 12 + complexity (min 8, digit + upper +
  lower)
- token.service.js — JWT HS256 access (1h) + opaque refresh (30d, bcrypt-
  hashed, rotated on use); session_id claim pre-wires future Valkey-based
  instant revocation; revokeSession + revokeAllSessionsForUser helpers
- social-identity.service.js — Google via google-auth-library, Apple via
  jwks-rsa + jsonwebtoken
- otp.service.js — Fazpass stub (generates locally, logs the code) clearly
  marked for replacement once real API docs arrive; rate-limit + resend
  cooldown + verify-attempts all configurable via app_config
- auth.service.js — orchestrator: signInAnonymous, completeCustomer/Mitra-
  PhoneSignIn, signInWithGoogle, signInWithApple, signInCcUser, refresh,
  logout; reject-on-existing for identity conflicts
- cc-user.service.js — email+password helpers + lockout counters

Routes & middleware:
- authenticate middleware now verifies our JWT and attaches
  request.auth = { userType, userId, sessionId }
- WebSocket handshake verifies our JWT (no more Firebase lookup)
- All existing routes updated to use request.auth.userId instead of
  request.firebaseUser.uid
- New public routes:
    /api/shared/auth/anonymous /refresh /logout
    /api/client/auth/otp/request /otp/verify /google /apple /me /profile
    /api/mitra/auth/otp/request /otp/verify /me
- New internal routes:
    /internal/auth/login /refresh /logout /me (httpOnly cookie refresh)
    /internal/control-center-users (accepts plain password, bcrypt-hashed)
    /internal/control-center-users/me/password (self-service change)
    /internal/control-center-users/:id/password (admin forced reset)
- Deleted legacy customer.routes.js (anonymous + link handled by auth now)
- app.internal.js: @fastify/cookie + CORS credentials for CC httpOnly cookie

Config:
- AUTH_JWT_SECRET + ACCESS_TOKEN_TTL_SECONDS + REFRESH_TOKEN_TTL_DAYS env
- FAZPASS_* env vars (TBD until real API docs)
- GOOGLE_OAUTH_CLIENT_IDS, APPLE_SERVICES_ID/TEAM_ID/KEY_ID/PRIVATE_KEY
- ADMIN_EMAIL + ADMIN_PASSWORD for seed
- CC_ORIGIN for internal-app CORS origin allowlist

Dependencies:
- Added: bcrypt, jsonwebtoken, jwks-rsa, google-auth-library, @fastify/cookie
- Kept: firebase-admin (messaging only)

Still outstanding: Fazpass API integration (stub in place), Apple Developer
prereqs for end-to-end iOS testing, client_app/mitra_app/control_center auth
flow rewrites.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/src/routes/public/shared.chat.routes.js

@@ -1,6 +1,4 @@
 import { authenticate } from '../../plugins/auth.js'
-import { getCustomerByFirebaseUid } from '../../services/customer.service.js'
-import { getMitraByFirebaseUid } from '../../services/mitra.service.js'
 import { getMessages } from '../../services/chat.service.js'
 import { getSessionClosures } from '../../services/closure.service.js'
 import { registerDeviceToken } from '../../services/notification.service.js'
@@ -11,22 +9,14 @@ import { TopicSensitivity, UserType } from '../../constants.js'
 const sql = getDb()
 
 const resolveUser = async (request, reply) => {
-  const customer = await getCustomerByFirebaseUid(request.firebaseUser.uid)
-  if (customer) {
-    request.userType = UserType.CUSTOMER
-    request.userId = customer.id
-    return
+  if (request.auth?.userType !== UserType.CUSTOMER && request.auth?.userType !== UserType.MITRA) {
+    return reply.code(403).send({
+      success: false,
+      error: { code: 'FORBIDDEN', message: 'Customer or mitra account required' },
+    })
   }
-  const mitra = await getMitraByFirebaseUid(request.firebaseUser.uid)
-  if (mitra) {
-    request.userType = UserType.MITRA
-    request.userId = mitra.id
-    return
-  }
-  return reply.code(404).send({
-    success: false,
-    error: { code: 'ACCOUNT_NOT_FOUND', message: 'Account not found' },
-  })
+  request.userType = request.auth.userType
+  request.userId = request.auth.userId
 }
 
 // Verify session belongs to the authenticated user