fix: add --version/-V flag to CLI (#309)

The CLI previously crashed when running `ha-mcp --version` because it
would attempt to create the server, which requires HOMEASSISTANT_URL
and HOMEASSISTANT_TOKEN environment variables.

Now the --version and -V flags are handled early, before any server
initialization, allowing users to check their installed version without
configuration.

Fixes #290

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: julienld

src/ha_mcp/__main__.py

@@ -255,6 +255,12 @@ async def _run_with_graceful_shutdown() -> None:
 # CLI entry point (for pyproject.toml) - use FastMCP's built-in runner
 def main() -> None:
     """Run server via CLI using FastMCP's stdio transport."""
+    # Handle --version flag early, before server creation requires config
+    if "--version" in sys.argv or "-V" in sys.argv:
+        from importlib.metadata import version
+        print(f"ha-mcp {version('ha-mcp')}")
+        sys.exit(0)
+
     # Check for smoke test flag
     if "--smoke-test" in sys.argv:
         from ha_mcp.smoke_test import main as smoke_test_main