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

#### PR Dependency Tree


* **PR #14934** 👈

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## 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.

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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/tsconfig.json

@@ -9,6 +9,7 @@
   },
   "references": [
     { "path": "../reader" },
+    { "path": "../realtime" },
     { "path": "../infra" },
     { "path": "../error" },
     { "path": "../graphql" },