Add automated PostgreSQL performance index management

- Add scripts and SQL for base and supplementary indexes (total 23)
- Integrate index checks and auto-creation into Jellyfin startup
- Update csproj to include SQL files in build/publish output
- Add diagnostics, publish/copy scripts, and troubleshooting docs
- Provide detailed guides for migration, verification, and merging
- Ensures robust, automated, and well-documented index setup

Add-Base-Indexes.bat

@@ -0,0 +1,37 @@
+@echo off
+REM Add missing base performance indexes to Jellyfin database
+
+echo ========================================
+echo Add Base Performance Indexes
+echo ========================================
+echo.
+echo These indexes were missing from InitialCreate
+echo Adding 18 essential performance indexes...
+echo.
+
+"C:\Program Files\PostgreSQL\18\bin\psql.exe" -U jellyfin -d jellyfin -f sql\add_base_performance_indexes.sql
+
+if %ERRORLEVEL% EQU 0 (
+    echo.
+    echo ========================================
+    echo Success! Base indexes added.
+    echo ========================================
+    echo.
+    echo Indexes created:
+    echo - 9 on BaseItems
+    echo - 2 on BaseItemProviders  
+    echo - 2 on MediaStreamInfos
+    echo - 2 on PeopleBaseItemMap
+    echo - 3 on UserData
+    echo.
+    echo Next: Restart Jellyfin
+    echo.
+) else (
+    echo.
+    echo ========================================
+    echo Failed to add indexes
+    echo ========================================
+    echo.
+)
+
+pause