Proxy-Awareness:
- Added ProxyHeadersMiddleware to detect and handle reverse proxy headers
- Implemented get_base_url() and url_for() helper functions for proxy-aware URL generation
- Updated all RedirectResponse calls to use url_for()
- Updated templates/base.html to use url_for() for all links and fetch calls
- Added comprehensive nginx proxy configuration examples to DOCUMENTATION.md
- Supports X-Forwarded-Proto, X-Forwarded-Host, X-Forwarded-Port, X-Forwarded-Prefix, X-Forwarded-For headers
- Application now fully supports deployment behind reverse proxies with subpaths

Configurable Error Cooldown:
- Added error_cooldown field to Model class in aisbf/models.py
- Added error_cooldown to ProviderModelConfig in aisbf/config.py
- Added default_error_cooldown to ProviderConfig in aisbf/config.py
- Added default_error_cooldown to RotationConfig in aisbf/config.py
- Updated BaseProviderHandler.record_failure() in aisbf/providers.py to use cascading cooldown configuration
- Cooldown configuration follows cascading pattern: model-specific > provider default > system default (300 seconds)
- Updated DOCUMENTATION.md with error_cooldown configuration examples
- Updated AI.PROMPT with error_cooldown documentation

Both features are fully documented and ready for production use.