Docs reorg, config refactor, and ItemValues index fix

- Moved all documentation to docs/ and updated README with categorized links and new docs/INDEX.md
- Added HOW_TO_SWITCH_DATABASE.md and several new analysis/action docs
- Introduced db-config.ps1 for centralized DB config; all scripts now use it for easy DB switching
- Added db-quick.ps1 for interactive diagnostics and index management
- Updated Add-All-Indexes.bat to use db-config.ps1
- Added Fix-ItemValues-Performance.ps1 to create 3 critical indexes on ItemValues, addressing 1.3B row seq scan issue
- Updated performance_indexes.sql with new ItemValues indexes and ANALYZE
- Updated diagnostics.sql and database_report.txt for improved output and clarity
- All scripts and docs now reference the new config and index optimization workflow

README.md

@@ -231,29 +231,56 @@ tail -f /var/log/jellyfin/log_*.txt
 
 ## 📖 Documentation
 
+### Getting Started
+- [START_HERE.md](./docs/START_HERE.md) - **Start here!** Quick guide for new users
+- [QUICK_REFERENCE.md](./docs/QUICK_REFERENCE.md) - Quick command reference
+
 ### Configuration
 - [OS_SPECIFIC_STARTUP_CONFIG.md](./docs/OS_SPECIFIC_STARTUP_CONFIG.md)
 - [STARTUP_JSON_VERIFICATION.md](./docs/STARTUP_JSON_VERIFICATION.md)
 - [STARTUP_JSON_FIX.md](./docs/STARTUP_JSON_FIX.md)
+- [HOW_TO_SWITCH_DATABASE.md](./docs/HOW_TO_SWITCH_DATABASE.md) - Switch between databases easily
 
-### PostgreSQL
+### PostgreSQL Setup & Migration
 - [QUICKSTART_POSTGRESQL.md](./docs/QUICKSTART_POSTGRESQL.md)
 - [POSTGRESQL_MIGRATION_COMPLETE.md](./docs/POSTGRESQL_MIGRATION_COMPLETE.md)
 - [POSTGRESQL_TROUBLESHOOTING.md](./docs/POSTGRESQL_TROUBLESHOOTING.md)
+- [MERGE_MIGRATIONS_GUIDE.md](./docs/MERGE_MIGRATIONS_GUIDE.md) - Merge pending migrations
+
+### Performance Optimization
+- [ADD_INDEXES_GUIDE.md](./docs/ADD_INDEXES_GUIDE.md) - Add performance indexes
+- [AUTO_APPLY_INDEXES_COMPLETE.md](./docs/AUTO_APPLY_INDEXES_COMPLETE.md) - Automatic index application
+- [ITEMVALUES_INDEXES_ADDED.md](./docs/ITEMVALUES_INDEXES_ADDED.md) - ItemValues table optimization
+- [MISSING_INDEXES_FIXED.md](./docs/MISSING_INDEXES_FIXED.md) - Index fixes
+
+### Database Diagnostics & Analysis
+- [DIAGNOSTICS_COMPLETE_SUMMARY.md](./docs/DIAGNOSTICS_COMPLETE_SUMMARY.md) - ⭐ Complete diagnostics overview
+- [DATABASE_ANALYSIS_REPORT.md](./docs/DATABASE_ANALYSIS_REPORT.md) - Detailed analysis
+- [LATEST_DIAGNOSTICS_ANALYSIS.md](./docs/LATEST_DIAGNOSTICS_ANALYSIS.md) - Latest diagnostics
+- [REMOTE_DATABASE_ANALYSIS.md](./docs/REMOTE_DATABASE_ANALYSIS.md) - Remote DB analysis
+- [REMOTE_ANALYSIS_SUMMARY.md](./docs/REMOTE_ANALYSIS_SUMMARY.md) - Remote DB summary
+- [QUICK_ACTION_PLAN.md](./docs/QUICK_ACTION_PLAN.md) - Performance action plan
+- [WEEKLY_TRACKING.md](./docs/WEEKLY_TRACKING.md) - Weekly performance tracking template
 
 ### Backup
 - [POSTGRES_BACKUP_IMPLEMENTATION.md](./docs/POSTGRES_BACKUP_IMPLEMENTATION.md)
 - [POSTGRESQL_BACKUP_ANALYSIS.md](./docs/POSTGRESQL_BACKUP_ANALYSIS.md)
 
-### Installation
+### Installation & Publishing
 - [INSTALLER_QUICK_START.md](./docs/INSTALLER_QUICK_START.md)
 - [INSTALLER_GUIDE.md](./docs/INSTALLER_GUIDE.md)
 - [CENTRALIZED_LIB_FOLDER.md](./docs/CENTRALIZED_LIB_FOLDER.md)
 - [BUILD_INSTALLER_FIXED.md](./docs/BUILD_INSTALLER_FIXED.md)
+- [SQL_FILES_PUBLISH_FIX.md](./docs/SQL_FILES_PUBLISH_FIX.md) - SQL files in publish
+- [SQL_PUBLISH_ISSUE_RESOLVED.md](./docs/SQL_PUBLISH_ISSUE_RESOLVED.md)
+- [QUICK_PUBLISH_REFERENCE.md](./docs/QUICK_PUBLISH_REFERENCE.md)
 
-### Project
+### Project Information
 - [PROJECT_COMPLETION.md](./docs/PROJECT_COMPLETION.md)
 - [POC_SUMMARY_REPORT.md](./docs/POC_SUMMARY_REPORT.md)
+- [IMPLEMENTATION_COMPLETE.md](./docs/IMPLEMENTATION_COMPLETE.md)
+- [PR_DESCRIPTION.md](./docs/PR_DESCRIPTION.md) - Pull request description
+- [PR_DESCRIPTION_SHORT.md](./docs/PR_DESCRIPTION_SHORT.md) - Short PR description
 
 [📁 View All Documentation →](./docs/)