feat(chat): implement sequence pre-allocation, versioned sync, and push worker

Introduce several performance and synchronization enhancements:
- Implement `SeqBufferManager` to allow sequence number pre-allocation via Redis Lua scripts, reducing atomic increment overhead.
- Add `PushWorker` to handle asynchronous message pushing using Redis Streams.
- Implement incremental conversation synchronization via `ConversationVersionLog` to allow clients to fetch only recent changes.
- Add support for Gzip compression in WebSocket communications to reduce bandwidth usage.
- Update dependency injection and configuration to support these new components.

configs/config.yaml

@@ -312,3 +312,24 @@ websocket:
     msg_channel: "ws:msg"     # Redis Pub/Sub 频道
     online_ttl: 60            # 在线状态 TTL（秒）
     heartbeat_interval: 20    # 心跳间隔（秒）
+
+# Seq 预分配配置
+# 环境变量:
+#   APP_SEQ_BUFFER_ENABLED, APP_SEQ_BUFFER_PRIVATE_BUFFER_SIZE
+#   APP_SEQ_BUFFER_GROUP_BUFFER_SIZE, APP_SEQ_BUFFER_LOCK_TIMEOUT_MS
+#   APP_SEQ_BUFFER_MAX_RETRIES
+seq_buffer:
+  enabled: false              # 启用后使用 Lua 预分配代替 INCR，关闭则回退旧逻辑
+  private_buffer_size: 50     # 私聊每次向 Redis 预分配步长
+  group_buffer_size: 200      # 群聊每次向 Redis 预分配步长（群聊消息更频繁）
+  lock_timeout_ms: 5000       # 分布式锁超时（毫秒）
+  max_retries: 3              # 冷启动获取锁失败最大重试次数
+
+# 版本日志增量同步配置
+# 环境变量:
+#   APP_VERSION_LOG_ENABLED, APP_VERSION_LOG_SYNC_LIMIT
+#   APP_VERSION_LOG_MAX_SYNC_GAP
+version_log:
+  enabled: false             # 启用后客户端可使用 /conversations/sync 增量同步
+  sync_limit: 100            # 单次同步最大返回变更条数
+  max_sync_gap: 1000         # 版本差距超过此值建议全量同步