feat(server): realtime notification & task status (#14934)

#### PR Dependency Tree


* **PR #14934** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Full realtime platform added: live notifications, comments, embedding
progress, and transcription task updates via realtime subscriptions.

* **Chores**
* Frontend switched from polling/GraphQL queries to realtime channels;
legacy query fields marked deprecated and client libs updated to use
realtime APIs.

[![Review Change
Stack](https://storage.googleapis.com/coderabbit_public_assets/review-stack-in-coderabbit-ui.svg)](https://app.coderabbit.ai/change-stack/toeverything/AFFiNE/pull/14934)
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#### PR Dependency Tree


* **PR #14934** 👈
  * **PR #14936**

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

packages/common/nbstore/package.json

@@ -19,6 +19,7 @@
   },
   "dependencies": {
     "@affine/reader": "workspace:*",
+    "@affine/realtime": "workspace:*",
     "@toeverything/infra": "workspace:*",
     "eventemitter2": "^6.4.9",
     "graphemer": "^1.4.0",
@@ -32,6 +33,7 @@
   "devDependencies": {
     "@affine/error": "workspace:*",
     "@affine/graphql": "workspace:*",
+    "@affine/realtime": "workspace:*",
     "@blocksuite/affine": "workspace:*",
     "fake-indexeddb": "^6.0.0",
     "idb": "^8.0.0",
@@ -41,6 +43,7 @@
   "peerDependencies": {
     "@affine/error": "workspace:*",
     "@affine/graphql": "workspace:*",
+    "@affine/realtime": "workspace:*",
     "@blocksuite/affine": "workspace:*",
     "idb": "^8.0.0",
     "socket.io-client": "^4.8.3"