Add handlers for enable_standard_headers, forward_auth_enabled, and waf_disabled fields
in the proxy host Update function. These fields were defined in the model but were not
being processed during updates, causing:
- 500 errors when saving proxy host configurations
- Auth pass-through failures for apps like Seerr/Overseerr due to missing X-Forwarded-* headers
Changes:
- backend: Add field handlers for 3 missing fields in proxy_host_handler.go
- backend: Add 5 comprehensive unit tests for field handling
- frontend: Update TypeScript ProxyHost interface with missing fields
- docs: Document fixes in CHANGELOG.md
Tests: All 1147 tests pass (backend 85.6%, frontend 87.7% coverage)
Security: No vulnerabilities (Trivy + govulncheck clean)
Fixes#16 (auth pass-through)
Fixes#17 (500 error on save)
- Add diagnostic logging to track security_header_profile_id conversions
- Replace silent failures with explicit HTTP 400 error responses
- Fix ProxyHostService.Update to properly handle nullable foreign keys
- Fix frontend dropdown to use explicit null checks (no falsy coercion)
- Add 7 comprehensive tests for profile assignment edge cases
Root cause: Backend handler had no else clause for type conversion failures,
causing old values to persist. Fixed by adding logging, error handling, and
changing service layer from Updates() to Select("*") for nullable FKs.
Refs: #<issue_number_if_applicable>
