[Feature] Fuzzy check: add reply processing and lifecycle management

[Feature] Fuzzy check: add reply processing and lifecycle management

Complete TCP reply handling:
- Process all error codes (403, 503, 415, 401) like UDP
- Handle FUZZY_STAT commands with proper storage
- Mark commands as replied and check session completion

Add memory safety and lifecycle management:
- Cleanup pending requests when task finishes before reply
- Timeout checking for pending requests (io_timeout)
- Proper session cleanup for TCP (no fd/ev_watcher)
- Initialize TCP session fields (fd=-1, event_loop)

Prevents use-after-free when:
- Task completes before TCP reply arrives
- Reply takes too long (timeout)
- Connection fails with pending requests