feat: replace script args with typed named parameters

- Change execute_script API from positional args list to named params dict
- Update service schema, API client, and constants
- Add execute_script service documentation to README

custom_components/remote_media_player/api_client.py

@@ -287,19 +287,21 @@ class MediaServerClient:
         return await self._request("GET", API_SCRIPTS_LIST)
 
     async def execute_script(
-        self, script_name: str, args: list[str] | None = None
+        self,
+        script_name: str,
+        params: dict[str, str | int | float | bool] | None = None,
     ) -> dict[str, Any]:
         """Execute a script on the server.
 
         Args:
             script_name: Name of the script to execute
-            args: Optional list of arguments to pass to the script
+            params: Optional named parameters (validated against script schema)
 
         Returns:
             Execution result with success, exit_code, stdout, stderr
         """
         endpoint = f"{API_SCRIPTS_EXECUTE}/{script_name}"
-        json_data = {"args": args or []}
+        json_data = {"params": params or {}}
         return await self._request("POST", endpoint, json_data)
 
     async def get_media_folders(self) -> dict[str, dict[str, Any]]: