Phase 3.3: topic sensitivity + Phase 3.4: auth foundation

Phase 3.3 — Session Topic Sensitivity (complete):
- Backend: topic_sensitivity column + session_sensitivity_log, sensitivity service
  (flip with one-way-latch + audit), PATCH /api/shared/chat/sessions/:id/topic,
  topic carried in pairing + extension WS payloads, CC filter + sensitive stats
  + per-mitra sensitive columns on activity page
- client_app: TopicSelectionBottomSheet before pricing, topic flows through
  pairing request, silent WS handler for session_topic_updated
- mitra_app: SensitivityBadge + SensitivityTheme + sensitivityConfigProvider,
  overlay badge + yellow accent, chat screen app-bar toggle with configurable
  confirmation + latch, extension card shows current flag, history + transcript
  yellow theme
- control_center: Sensitivitas Topik settings section, topic filter + column
  with inline audit log, sensitive stats dashboard card, mitra activity
  sensitive columns with QC flag

Phase 3.4 — Self-Managed Auth (foundation only):
- Migration: auth_sessions + otp_requests tables, social identity columns on
  customers, password_hash + lockout on control_center_users, OTP + CC lockout
  app_config keys
- New services: password (bcrypt + complexity), token (JWT HS256 + refresh
  rotation, session_id claim pre-wires future Valkey revocation),
  social-identity (Google + Apple JWKS), OTP (Fazpass stub — real API TBD)
- Constants: AuthProvider + OtpChannel
- Middleware, auth route rewrites, WS auth update, Firebase → FCM isolation
  still pending (next chunk); Fazpass docs + Apple Developer setup still
  required before E2E testing

Docs:
- requirement/phase3.3.md, phase3.3-plan.md, phase3.3-testing.md
- requirement/phase3.4.md, phase3.4-plan.md

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

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

@@ -1,9 +1,14 @@
 import { authenticate } from '../../plugins/auth.js'
-import { getAnonymityConfig } from '../../services/config.service.js'
+import { getAnonymityConfig, getSensitivityConfig } from '../../services/config.service.js'
 
 export const sharedConfigRoutes = async (app) => {
   app.get('/anonymity', async (request, reply) => {
     const config = await getAnonymityConfig()
     return reply.send({ success: true, data: config })
   })
+
+  app.get('/sensitivity', { preHandler: [authenticate] }, async (request, reply) => {
+    const config = await getSensitivityConfig()
+    return reply.send({ success: true, data: config })
+  })
 }