Add CI/CD pipelines, NSIS installer, ES module bundling, and ruff linting

- Add Gitea Actions workflows: test.yml (lint + test on push/PR) and
  release.yml (build + NSIS installer + upload on v* tags)
- Add NSIS installer with optional desktop shortcut and auto-start
- Add esbuild bundler: ES module migration with IIFE bundle output
- Add build-dist-windows.sh for cross-building Windows distribution
- Fix all ruff lint errors (import sorting, unused imports, line length)
- Remove redundant scripts (start-server.bat, stop-server.bat,
  start-server-background.vbs)
- Update CLAUDE.md with CI/CD and release documentation

media_server/routes/callbacks.py

@@ -2,7 +2,6 @@
 
 import asyncio
 import logging
-import re
 import subprocess
 import time
 from concurrent.futures import ThreadPoolExecutor
@@ -238,7 +237,10 @@ async def create_callback(
     if callback_name in settings.callbacks:
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
-            detail=f"Callback '{callback_name}' already exists. Use PUT /api/callbacks/update/{callback_name} to update it.",
+            detail=(
+                f"Callback '{callback_name}' already exists."
+                f" Use PUT /api/callbacks/update/{callback_name} to update it."
+            ),
         )
 
     # Create callback config
@@ -283,7 +285,10 @@ async def update_callback(
     if callback_name not in settings.callbacks:
         raise HTTPException(
             status_code=status.HTTP_404_NOT_FOUND,
-            detail=f"Callback '{callback_name}' not found. Use POST /api/callbacks/create/{callback_name} to create it.",
+            detail=(
+                f"Callback '{callback_name}' not found."
+                f" Use POST /api/callbacks/create/{callback_name} to create it."
+            ),
         )
 
     # Create updated callback config