chore: finalize Axiom RAG pgvector migration, DOCX parsing, and LLM reliability

feat: enterprise production updates and Axiom rebranding

Code quality, security, and cleanup improvements

feat: add all untracked files — frontend, core, routes

fix: hf deployment crash

fix: disable google_auth router to fix HF deployment

Added auth, documents routes, updated frontend and core logic

Fix: load pipeline in background thread at startup

Initial commit — Veritas RAG system