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-Indexes-Quick.bat

@@ -0,0 +1,38 @@
+@echo off
+REM Quick script to add supplementary indexes to jellyfin_testsdata
+
+echo ========================================
+echo Add Supplementary Indexes
+echo ========================================
+echo.
+
+echo Connecting to jellyfin_testsdata database...
+echo.
+
+REM Apply the indexes
+"C:\Program Files\PostgreSQL\18\bin\psql.exe" -U jellyfin -d jellyfin -f sql\schema_init\10_create_supplementary_indexes.sql
+
+if %ERRORLEVEL% EQU 0 (
+    echo.
+    echo ========================================
+    echo Success! Indexes added.
+    echo ========================================
+    echo.
+    echo Next steps:
+    echo 1. Restart Jellyfin
+    echo 2. Monitor performance
+    echo.
+) else (
+    echo.
+    echo ========================================
+    echo Failed to add indexes
+    echo ========================================
+    echo.
+    echo Troubleshooting:
+    echo - Ensure PostgreSQL is running
+    echo - Check database name is correct
+    echo - Verify credentials
+    echo.
+)
+
+pause