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.ps1

@@ -0,0 +1,20 @@
+# Add Supplementary Indexes - Quick Command
+
+Write-Host "Connecting to jellyfin_testsdata and adding supplementary indexes..." -ForegroundColor Cyan
+Write-Host ""
+
+# Quick and simple - just run the SQL script
+psql -U jellyfin -d jellyfin_testsdata -f sql\schema_init\10_create_supplementary_indexes.sql
+
+if ($LASTEXITCODE -eq 0) {
+    Write-Host ""
+    Write-Host "✓ Success! Supplementary indexes added." -ForegroundColor Green
+    Write-Host ""
+    Write-Host "Next: Restart Jellyfin to see performance improvements" -ForegroundColor Yellow
+} else {
+    Write-Host ""
+    Write-Host "❌ Failed. Check that:" -ForegroundColor Red
+    Write-Host "  - PostgreSQL is running" -ForegroundColor Gray
+    Write-Host "  - Database 'jellyfin_testsdata' exists" -ForegroundColor Gray
+    Write-Host "  - You have the correct password" -ForegroundColor Gray
+}