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

installer.nsi

@@ -0,0 +1,135 @@
+; Media Server NSIS Installer
+; Cross-compilable: apt install nsis && makensis -DVERSION="1.0.0" installer.nsi
+
+!include "MUI2.nsh"
+!include "FileFunc.nsh"
+
+; --- Configuration ---
+!define APPNAME "Media Server"
+!define EXENAME "media-server.bat"
+!define VBSNAME "start-hidden.vbs"
+!ifndef VERSION
+    !define VERSION "0.0.0"
+!endif
+
+Name "${APPNAME} ${VERSION}"
+OutFile "build\MediaServer-v${VERSION}-setup.exe"
+InstallDir "$LOCALAPPDATA\${APPNAME}"
+RequestExecutionLevel user
+
+; --- UI ---
+; To use a custom icon, convert icon.svg to icon.ico and uncomment:
+; !define MUI_ICON "media_server\static\icons\icon.ico"
+; !define MUI_UNICON "media_server\static\icons\icon.ico"
+!define MUI_ABORTWARNING
+
+!insertmacro MUI_PAGE_WELCOME
+!insertmacro MUI_PAGE_DIRECTORY
+!insertmacro MUI_PAGE_COMPONENTS
+!insertmacro MUI_PAGE_INSTFILES
+!insertmacro MUI_PAGE_FINISH
+
+!insertmacro MUI_UNPAGE_CONFIRM
+!insertmacro MUI_UNPAGE_INSTFILES
+
+!insertmacro MUI_LANGUAGE "English"
+
+; --- Sections ---
+Section "!Core (required)" SecCore
+    SectionIn RO
+
+    ; Stop running instance if any
+    nsExec::ExecToLog 'taskkill /F /IM python.exe /FI "WINDOWTITLE eq media_server*"'
+
+    SetOutPath "$INSTDIR"
+
+    ; Copy entire distribution
+    File /r "dist\media-server\*.*"
+
+    ; Create uninstaller
+    WriteUninstaller "$INSTDIR\uninstall.exe"
+
+    ; Start Menu shortcuts
+    CreateDirectory "$SMPROGRAMS\${APPNAME}"
+    CreateShortcut "$SMPROGRAMS\${APPNAME}\${APPNAME}.lnk" \
+        "wscript.exe" '"$INSTDIR\scripts\${VBSNAME}"' \
+        "$INSTDIR\python\python.exe" 0
+    CreateShortcut "$SMPROGRAMS\${APPNAME}\${APPNAME} (Console).lnk" \
+        "$INSTDIR\${EXENAME}" "" \
+        "$INSTDIR\python\python.exe" 0
+    CreateShortcut "$SMPROGRAMS\${APPNAME}\Uninstall.lnk" \
+        "$INSTDIR\uninstall.exe"
+
+    ; Registry for Add/Remove Programs
+    WriteRegStr HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+        "DisplayName" "${APPNAME}"
+    WriteRegStr HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+        "DisplayVersion" "${VERSION}"
+    WriteRegStr HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+        "UninstallString" "$\"$INSTDIR\uninstall.exe$\""
+    WriteRegStr HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+        "InstallLocation" "$INSTDIR"
+    WriteRegStr HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+        "Publisher" "Alexei Dolgolyov"
+    WriteRegDWORD HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+        "NoModify" 1
+    WriteRegDWORD HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+        "NoRepair" 1
+
+    ; Calculate installed size
+    ${GetSize} "$INSTDIR" "/S=0K" $0 $1 $2
+    IntFmt $0 "0x%08X" $0
+    WriteRegDWORD HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+        "EstimatedSize" "$0"
+SectionEnd
+
+Section "Desktop shortcut" SecDesktop
+    CreateShortcut "$DESKTOP\${APPNAME}.lnk" \
+        "wscript.exe" '"$INSTDIR\scripts\${VBSNAME}"' \
+        "$INSTDIR\python\python.exe" 0
+SectionEnd
+
+Section "Start with Windows" SecAutostart
+    ; Create Startup folder shortcut (runs hidden via VBS)
+    CreateShortcut "$SMSTARTUP\${APPNAME}.lnk" \
+        "wscript.exe" '"$INSTDIR\scripts\${VBSNAME}"' \
+        "$INSTDIR\python\python.exe" 0
+SectionEnd
+
+; --- Section descriptions ---
+!insertmacro MUI_FUNCTION_DESCRIPTION_BEGIN
+    !insertmacro MUI_DESCRIPTION_TEXT ${SecCore} \
+        "Core application files, embedded Python, and Start Menu shortcuts."
+    !insertmacro MUI_DESCRIPTION_TEXT ${SecDesktop} \
+        "Create a desktop shortcut to launch ${APPNAME}."
+    !insertmacro MUI_DESCRIPTION_TEXT ${SecAutostart} \
+        "Automatically start ${APPNAME} when you log in to Windows."
+!insertmacro MUI_FUNCTION_DESCRIPTION_END
+
+; --- Uninstaller ---
+Section "Uninstall"
+    ; Stop running instance
+    nsExec::ExecToLog 'taskkill /F /IM python.exe /FI "WINDOWTITLE eq media_server*"'
+
+    ; Remove application files
+    RMDir /r "$INSTDIR\python"
+    RMDir /r "$INSTDIR\app"
+    RMDir /r "$INSTDIR\scripts"
+    Delete "$INSTDIR\${EXENAME}"
+    Delete "$INSTDIR\VERSION"
+    Delete "$INSTDIR\uninstall.exe"
+
+    ; Preserve config.yaml (user data) — only remove the example
+    Delete "$INSTDIR\config.example.yaml"
+
+    ; Remove shortcuts
+    Delete "$DESKTOP\${APPNAME}.lnk"
+    Delete "$SMSTARTUP\${APPNAME}.lnk"
+    RMDir /r "$SMPROGRAMS\${APPNAME}"
+
+    ; Remove registry
+    DeleteRegKey HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}"
+
+    ; Remove install dir only if empty (config.yaml may remain)
+    RMDir "$INSTDIR"
+SectionEnd