Initial commit: HACS-ready Home Assistant integration

Remote Media Player integration for controlling PC media playback
from Home Assistant via the Media Server API.

Features:
- Full media player controls (play, pause, stop, next, previous)
- Volume control and mute
- Seek support with smooth timeline updates
- Real-time updates via WebSocket
- Script buttons for PC control (shutdown, restart, lock, etc.)

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: