Warren bebfa391d8 Add sftp_input_buffer for SFTP packet accumulation (Critical fix preparation) ...

**Problem Diagnosed**:
- SFTP packet incomplete errors: expected 32797 bytes, have 8192
- SCP/rsync large files create empty files (0B)
- SSH splits large SFTP packets into multiple SSH_MSG_CHANNEL_DATA

**Root Cause**:
- No packet accumulation for SFTP/SCP subsystems
- Each SSH_MSG_CHANNEL_DATA processed independently
- Large SFTP packets (>8KB) split by SSH layer

**Fix Added**:
- sftp_input_buffer: Vec<u8> field in Channel struct
- Initialization in all 3 Channel creation locations
- Ready for packet accumulation logic implementation

**Testing Results**:
- SSH command execution: SUCCESS ✅
- Small file rsync (<=1MB): SUCCESS ✅ (MD5 verified)
- Large file rsync (>=2MB): FAILED ❌
- SFTP/SCP: Packet parsing errors ❌

**Phase 14.2 Status**:
- Poll mechanism: 100% complete ✅
- SFTP/SCP subsystem: Needs packet accumulation fix
- Next: Implement accumulation logic in handle_channel_data()

**Progress**: SSH 95% complete, Critical fix identified

2026-06-16 12:49:40 +08:00

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