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

scripts/start-server-background.vbs

@@ -1,7 +0,0 @@
-Set WshShell = CreateObject("WScript.Shell")
-Set FSO = CreateObject("Scripting.FileSystemObject")
-' Get parent folder of scripts folder (media-server root)
-WshShell.CurrentDirectory = FSO.GetParentFolderName(FSO.GetParentFolderName(WScript.ScriptFullName))
-WshShell.Run "python -m media_server.main", 0, False
-Set FSO = Nothing
-Set WshShell = Nothing

scripts/start-server.bat

@@ -1,15 +0,0 @@
-@echo off
-REM Media Server Startup Script
-REM This script starts the media server
-
-echo Starting Media Server...
-echo.
-
-REM Change to the media-server directory (parent of scripts folder)
-cd /d "%~dp0\.."
-
-REM Start the media server
-python -m media_server.main
-
-REM If the server exits, pause to show any error messages
-pause

scripts/stop-server.bat

@@ -1,19 +0,0 @@
-@echo off
-REM Media Server Stop Script
-REM This script stops the running media server
-
-echo Stopping Media Server...
-echo.
-
-REM Find and kill Python processes running media_server.main
-for /f "tokens=2" %%i in ('tasklist /FI "IMAGENAME eq python.exe" /FO LIST ^| findstr /B "PID:"') do (
-    wmic process where "ProcessId=%%i" get CommandLine 2>nul | findstr /C:"media_server.main" >nul
-    if not errorlevel 1 (
-        taskkill /PID %%i /F
-        echo Media server process (PID %%i) terminated.
-    )
-)
-
-echo.
-echo Done! Media server stopped.
-pause