hotfix(v1.7.9): auth diagnostics and rate-limit exemptions
- Exempt /api/config/auth, /api/config/features, /health, /metrics from rate limiting - Fix generic exception handler to return proper JSON for HTTPException instead of re-raising - Add startup log with auth_enabled and version - Add frontend console logging for auth config fetch errors - Show 'Auth: OFF' or 'Auth: misconfigured' on auth button instead of empty text - Add backend debug logging to /api/config/auth endpoint
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