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.chat.routes.js

@@ -4,8 +4,9 @@ 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'
+import { flipSessionSensitivity } from '../../services/sensitivity.service.js'
 import { getDb } from '../../db/client.js'
-import { UserType } from '../../constants.js'
+import { TopicSensitivity, UserType } from '../../constants.js'
 
 const sql = getDb()
 
@@ -96,4 +97,35 @@ export const sharedChatRoutes = async (app) => {
     const closure = await submitClosureMessage(sessionId, request.userType, request.userId, message)
     return reply.send({ success: true, data: closure })
   })
+
+  // Mitra flips session topic sensitivity (regular <-> sensitive)
+  app.patch('/chat/sessions/:sessionId/topic', { preHandler: [authenticate, resolveUser] }, async (request, reply) => {
+    if (request.userType !== UserType.MITRA) {
+      return reply.code(403).send({
+        success: false,
+        error: { code: 'FORBIDDEN', message: 'Only mitra can change topic sensitivity' },
+      })
+    }
+    const { sessionId } = request.params
+    const { topic_sensitivity } = request.body || {}
+    if (topic_sensitivity !== TopicSensitivity.REGULAR && topic_sensitivity !== TopicSensitivity.SENSITIVE) {
+      return reply.code(400).send({
+        success: false,
+        error: { code: 'BAD_REQUEST', message: 'topic_sensitivity must be regular or sensitive' },
+      })
+    }
+    try {
+      const result = await flipSessionSensitivity({
+        sessionId,
+        mitraId: request.userId,
+        toValue: topic_sensitivity,
+      })
+      return reply.send({ success: true, data: result })
+    } catch (err) {
+      return reply.code(err.statusCode || 500).send({
+        success: false,
+        error: { code: err.code || 'INTERNAL', message: err.message },
+      })
+    }
+  })
 }