fix: robust OCR/image ingestion parsing and add one-click Supabase document deletion to Search Playground

Security Hardening: Fixed path traversal, BM25 RCE, IDOR, and removed backdoor

feat: enterprise multi-page RAG platform with GraphRAG, CRAG, Guardrails, and VectorDB Inspector

feat: Implement GLM-4.7-Flash RAGAS Judge and LLM fallback (Qwen -> GLM-4.7-Flash)

Fix file upload UI refresh and add Metadata Filters UI

Initial commit: Multimodal RAG Pipeline V3.0 with Fallback Logic