Speed up WD inference with real batching and harden reclassify cancel/retry.

Enhance backend API and frontend components for reclassification and debugging. Introduce new request and response schemas for reclassification, update inference settings, and improve handling of inference modes. Add a debug interface for SFW evaluation and integrate reclassification functionality into the frontend, allowing users to retry with different models. Update styles for better UI presentation and ensure proper environment variable handling during startup.