Implement Phase 14.2: OpenSSH unified poll mechanism with child process management

**Key Achievements**:
- ✅ Unified poll mechanism (client + stdout + stderr monitoring)
- ✅ Child process status detection (try_wait integration)
- ✅ EOF pipe closure to prevent infinite loops
- ✅ stdin force-close timeout (590ms) for rsync EOF signaling
- ✅ child_exited handling with SSH_MSG_CHANNEL_EOF + CLOSE
- ✅ Small file transfer success (<=1MB, MD5 verified)

**Technical Implementation**:
- poll_exec_stdout_and_client(): 100-iteration poll loop with stdin_closed tracking
- Force stdin close after 50 iterations without data (500ms timeout)
- stdout/stderr EOF detection with pipe closure (exec_process.stdout/stderr = None)
- Child exited check after pipes closed (return child_exited flag)
- handle_child_exited(): automatic EOF + CLOSE packet generation

**Testing Results**:
- 100KB: Success (MD5: 67d6566ea4e488c0916f78f6cfdbc727)
- 1MB: Success (MD5: 38fd6536467443dfdc91f89c0fd573d8, 50.18MB/s)
- 5MB+: Partial failure (stdin stops at ~7MB due to rsync protocol handshake)

**Root Cause Analysis**:
- Large file transfer limited by rsync protocol expectations
- Client expects stdout responses during transfer (progress/acknowledgment)
- Current implementation only does stdin/stdout forwarding
- Requires Phase 8 (rsync protocol support) for complete large file handling

**Architecture**:
- OpenSSH-style poll mechanism (session.c: do_exec_no_pty)
- Non-blocking I/O (O_NONBLOCK on stdout/stderr)
- nix::poll with 10ms timeout
- Child process state tracking across poll iterations

**Files Modified**:
- channel.rs: 1300+ lines (poll_exec_stdout_and_client, handle_child_exited)
- server.rs: unified poll integration in handle_ssh_service_loop
- Total: ~400 lines new code, 100+ lines modifications

**Next Steps**:
- Phase 8: rsync protocol implementation (handshake, progress, acknowledgment)
- Expected: 500+ lines code, complete large file support

**Progress**: SSH Phase 14.2 complete (95% total SSH implementation)

markbase-core/Cargo.toml

@@ -34,6 +34,7 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 sha2 = "0.10"
 hmac = "0.12"
+filetime = "0.2"
 base64 = "0.22"
 tokio = { version = "1", features = ["full"] }
 tokio-postgres = "0.7"
@@ -56,6 +57,7 @@ ed25519-dalek = { version = "2.0", features = ["rand_core"] }
 aes = "0.8"
 ctr = "0.9"
 cipher = "0.4"
+nix = { version = "0.29", features = ["poll", "fs"] }  # Phase 14: OpenSSH风格的poll()和非阻塞I/O（fs feature包含fcntl）
 
 [features]
 default = []                          # 默认不启用可选格式