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/services/thumbnail_service.py

@@ -3,9 +3,7 @@
 import asyncio
 import hashlib
 import logging
-import os
 import shutil
-import subprocess
 from pathlib import Path
 from typing import Optional
 
@@ -151,10 +149,10 @@ class ThumbnailService:
             Thumbnail bytes (JPEG) or None if no album art.
         """
         try:
-            import mutagen
+            from io import BytesIO
+
             from mutagen import File as MutagenFile
             from PIL import Image
-            from io import BytesIO
 
             audio = MutagenFile(str(file_path))
             if audio is None:
@@ -232,9 +230,10 @@ class ThumbnailService:
             Thumbnail bytes (JPEG) or None if ffmpeg not available.
         """
         try:
-            from PIL import Image
             from io import BytesIO
 
+            from PIL import Image
+
             # Check if ffmpeg is available
             if not shutil.which("ffmpeg"):
                 logger.debug("ffmpeg not available, cannot generate video thumbnail")
@@ -247,7 +246,11 @@ class ThumbnailService:
             cmd = [
                 "ffmpeg",
                 "-i", str(file_path),
-                "-vf", f"thumbnail,scale={target_size[0]}:{target_size[1]}:force_original_aspect_ratio=increase,crop={target_size[0]}:{target_size[1]}",
+                "-vf", (
+                    f"thumbnail,scale={target_size[0]}:{target_size[1]}"
+                    f":force_original_aspect_ratio=increase"
+                    f",crop={target_size[0]}:{target_size[1]}"
+                ),
                 "-frames:v", "1",
                 "-f", "image2pipe",
                 "-vcodec", "mjpeg",