lan 8d7e8c427b feat(chat): implement batch mark-as-read and message sync data ...

Refactor unread count logic to use arithmetic calculation (maxSeq - readSeq)
instead of manual incrementing/decrementing. This simplifies the cache
management and improves consistency.

New features:
- Batch mark-as-read functionality for multiple conversations.
- Lightweight sync data endpoint to retrieve conversation metadata
  (maxSeq and last message timestamp) for client synchronization.
- Optimized batch retrieval of conversation max sequences using Redis MGet.

Technical changes:
- Deprecated `IncrementUnread` and `ClearUnread` in `ConversationCache`.
- Added `GetConvMaxSeqBatch` to reduce network round-trips.
- Added `HandleMarkReadAll` and `HandleGetSyncData` handlers.
- Updated `ChatService` to support batch operations and sync data retrieval.

2026-05-12 18:04:59 +08:00

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