Update app.py

Update app.py

feat: Deploy SpectralDetector V3.6 Cascaded - 4-HEAD system (A/B/C/D) with temperature calibration

Internationalize UI to English and simplify technical details for publication

Fix: upgrade pickles to numpy 2.x, add pydantic 2.10.6, recreate meta-router, export demo at module level

Fix: classify() expects image_path, save temp file from Gradio upload

Fix: pin gradio-client and enable share=True for HF Spaces

Fix: downgrade Gradio to 4.36.0 and simplify launch

Initial deployment - SpectralDetector V3.5