feat(skill): support StartChat SSE reconnect

[guima-why]

Summary

• add StartChat SSE reconnect handling for alicloud-ros-agent code and aliyun CLI local/remote transports
• preserve committed full SSE cursors and resume the same Session without resending Query
• add Qoder Work -> fake aliyun CLI -> MCP -> real aliyun CLI -> ROS pre E2E harness
• document the reconnect E2E workflow in the existing English and Chinese E2E guides

Verification

• uv run pytest -q tests/skill_bridge/test_alicloud_ros_agent_bridge.py tests/skill_bridge/test_start_chat_relay.py tests/a2a_e2e/test_qoder_mcp_reconnect.py (226 passed)
• A2A/provider/resource-selector/session-manager compatibility suite (3270 passed)
• make lint
• Qoder Work real-cloud E2E against ros-pre.aliyuncs.com with profile test-guima: normal, first-call timeout, and reconnect-call timeout scenarios passed

Notes

• aliyun CLI reconnect sends flat StreamOptions.Action and StreamOptions.Cursor fields in the single --body value
• reconnect omits Query and reuses the server-returned SessionId and latest committed full cursor