Backoffice stage 2: chats (support + concierge, files)

- ChatThread per client/provider and channel; messages get files, internal notes,
  source (bot/mini app) and delivery errors; reply templates. Migration moves old
  concierge messages into threads.
- Routing: subscribers write to the concierge, others to support; /support and
  /concierge in the client bot; staff can take, transfer, close and move threads.
- Telegram: photos/documents from clients and providers, replies with the channel
  header, files sent from storage, notifications only to the assignee or the
  channel's staff, "Reply" into a specific thread.
- New admin: /chats with list, conversation, notes, files, templates, client panel;
  "Message" button on the client card; dashboard counts threads awaiting reply.
- Client mini app: in-app chat screen sharing the same conversation.
- Old admin keeps working on the same data (notes hidden there).
- Tests for routing, notes, assign/close/move, lists, recipients; separate test DB
  via TEST_DB_NAME; dev:chats-demo script.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

packages/services/package.json

@@ -7,23 +7,25 @@
     ".": "./src/index.ts",
     "./queue": "./src/queue.ts",
     "./env": "./src/env.ts",
-    "./telegram": "./src/telegram.ts"
+    "./telegram": "./src/telegram.ts",
+    "./storage": "./src/storage.ts"
   },
   "scripts": {
     "test": "vitest run",
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
+    "@aws-sdk/client-s3": "^3.1152.0",
     "@barev/core": "workspace:*",
     "@barev/db": "workspace:*",
+    "@barev/i18n": "workspace:*",
     "bullmq": "^5.81.5",
-    "dotenv": "^17.0.0",
-    "@barev/i18n": "workspace:*"
+    "dotenv": "^17.0.0"
   },
   "devDependencies": {
+    "@types/pg": "^8.15.0",
     "dotenv": "^17.0.0",
-    "vitest": "^4.1.0",
     "pg": "^8.16.0",
-    "@types/pg": "^8.15.0"
+    "vitest": "^4.1.0"
   }
 }