Fix: upload actual app.py content (was literal string from previous upload)

Replace piiranha-v1 CPU fallback with GLiNER-PII (zero-shot, 60+ entity types, F1=81%)

Fix: gate GPU path on torch.cuda.is_available() — ZeroGPU sets CUDA emulation at startup, CPU Spaces don't

Dual-mode: openai/privacy-filter on ZeroGPU, piiranha-v1 CPU fallback

Switch PII detection model from piiranha NER to openai/privacy-filter (1.4B MoE)

Add main application: PDF PII Redactor with NER + regex + OCR pipeline