Initial commit: Media server and Home Assistant integration

- FastAPI server for Windows media control via WinRT/SMTC
- Home Assistant custom integration with media player entity
- Script button entities for system commands
- Position tracking with grace period for track skip handling
- Server availability detection in HA entity

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

custom_components/remote_media_player/services.yaml

@@ -0,0 +1,18 @@
+execute_script:
+  name: Execute Script
+  description: Execute a pre-defined script on the media server
+  fields:
+    script_name:
+      name: Script Name
+      description: Name of the script to execute (as defined in server config)
+      required: true
+      example: "launch_spotify"
+      selector:
+        text:
+    args:
+      name: Arguments
+      description: Optional list of arguments to pass to the script
+      required: false
+      example: '["arg1", "arg2"]'
+      selector:
+        object: