feat: add CD pipeline with deploy to test target

- Add src/hello.py and tests/test_hello.py
- Replace deploy placeholder with actual rsync + health check
- Deploy target: ~/.sanguo_projects/moziplus-v2-cd-test/
- Add deploy history recording
- Add failure notification via Issue creation

src/hello.py

@@ -0,0 +1,9 @@
+"""Hello module for CD testing."""
+
+def greet(name: str) -> str:
+    """Return greeting message."""
+    return f"Hello, {name}!"
+
+def health() -> dict:
+    """Return health status."""
+    return {"status": "ok", "version": "1.0.0"}