chore: init decky vaultwarden plugin scaffold

decky.pyi

@@ -0,0 +1,38 @@
+"""
+Type stubs for Decky plugin development.
+"""
+from typing import Any, Callable, Optional
+
+
+class logger:
+    """Plugin logger."""
+    @staticmethod
+    def info(msg: str) -> None: ...
+    @staticmethod
+    def warning(msg: str) -> None: ...
+    @staticmethod
+    def error(msg: str) -> None: ...
+    @staticmethod
+    def debug(msg: str) -> None: ...
+
+
+class plugin:
+    """Plugin decorator and utilities."""
+    @staticmethod
+    def call(method: str, *args: Any) -> Any: ...
+
+
+# Plugin lifecycle methods
+async def _main() -> None:
+    """Called when plugin loads."""
+    pass
+
+
+async def _unload() -> None:
+    """Called when plugin unloads."""
+    pass
+
+
+async def _migration() -> None:
+    """Called on plugin version change."""
+    pass