refactor(git): drop hook pool, sync execution is now direct and sequential
- Remove entire pool/ directory (RedisConsumer, CpuMonitor, LogStream, HookTask, TaskType)
- Remove Redis distributed lock (acquire_lock/release_lock) — K8s StatefulSet
scheduling guarantees exclusive access per repo shard
- Remove sync/lock.rs, sync/remote.rs, sync/status.rs (dead code)
- Remove hook/event.rs (GitHookEvent was never used)
- New HookService exposes sync_repo / fsck_repo / gc_repo directly
- ReceiveSyncService now calls HookService inline instead of LPUSH to Redis queue
- sync/mod.rs: git2 operations wrapped in spawn_blocking for Send safety
(git2 types are not Send — async git2 operations must not cross await points)
- scripts/push.js: drop 'frontend' from docker push list (embedded into static binary)
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