Improve Backups, Trakt Metadata, and System Administration

This release improves backup and restore capabilities, enhances Trakt-related request tracking, and introduces several administrative and reliability improvements.

💾 Backup & Restore

• Added support for exporting and importing media user mappings and Trakt account metadata (#374) @selmant
• Added safe-by-default config exports with automatic secret redaction
• Added optional full backup mode for exporting API keys, tokens, and credentials
• Improved config import behavior to preserve existing secrets when importing redacted backups
• Shared secret redaction logic across configuration export endpoints
• Added documentation for the recommended Dashboard backup and restore workflow

🔄 Trakt Integration

• Added source_origin tracking for requests created from Trakt-sourced content
• Improved visibility of where requests originate within the application
• Preserved Trakt account associations during configuration backup and restore

⚙️ Administration & Monitoring

• Added pagination support for log retrieval using limit and offset parameters
• Improved auditability and performance when browsing large log datasets
• Fixed manual cleanup execution flow and improved admin access validation (#369)

🛠 Fixes

• Fixed cleanup automation execution path for manual runs
• Improved backup handling to safely merge redacted configuration snapshots
• Added additional test coverage for admin-only operations and backup workflows

📚 Documentation

• Added backup and restore documentation to INSTALLATION.md
• Expanded configuration export guidance and security recommendations

📦 Dependencies

• Updated multiple Python dependencies
• Updated Redis, OpenAI, and Flask-CORS related dependencies
• Updated GitHub Actions workflows

🧹 Misc

• General maintenance, internal cleanup, and stability improvements