chore(server): improve transcript stability (#13821)

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

* **New Features**
* Enhanced audio/video detection for MP4 files to better distinguish
audio-only vs. video.

* **Dependencies**
* Added MP4 parsing dependency and updated AI provider libraries
(Anthropic, Google, OpenAI, etc.).

* **Bug Fixes**
  * Tightened authentication state validation for magic-link/OTP flows.
* Stricter space-join validation to reject invalid client
types/versions.
  * Improved transcript entry deduplication and data handling.

* **API**
* Transcript submit payload now requires infos and removes deprecated
url/mimeType fields.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/package.json

@@ -28,12 +28,12 @@
   "dependencies": {
     "@affine/reader": "workspace:*",
     "@affine/server-native": "workspace:*",
-    "@ai-sdk/anthropic": "^2.0.1",
-    "@ai-sdk/google": "^2.0.4",
-    "@ai-sdk/google-vertex": "^3.0.5",
-    "@ai-sdk/openai": "^2.0.10",
-    "@ai-sdk/openai-compatible": "^1.0.5",
-    "@ai-sdk/perplexity": "^2.0.1",
+    "@ai-sdk/anthropic": "^2.0.38",
+    "@ai-sdk/google": "^2.0.24",
+    "@ai-sdk/google-vertex": "^3.0.54",
+    "@ai-sdk/openai": "^2.0.56",
+    "@ai-sdk/openai-compatible": "^1.0.23",
+    "@ai-sdk/perplexity": "^2.0.14",
     "@apollo/server": "^4.11.3",
     "@aws-sdk/client-s3": "^3.779.0",
     "@aws-sdk/s3-request-presigner": "^3.779.0",
@@ -75,7 +75,7 @@
     "@prisma/instrumentation": "^6.7.0",
     "@react-email/components": "0.0.38",
     "@socket.io/redis-adapter": "^8.3.0",
-    "ai": "^5.0.10",
+    "ai": "^5.0.81",
     "bullmq": "^5.40.2",
     "cookie-parser": "^1.4.7",
     "cross-env": "^7.0.3",