perf: Optimize RAM footprint to stay under 512MB for low-memory containers

fix: Add safe response handling and error alerts for text and voice queries in web UI

feat: Optimize Dockerfile configuration for production deployment

feat: Add VisionQuest Indic RAG main server, index builders, and documentation

feat: Add VisionQuest Indic RAG core services, vector search, safety guardrails & web UI

Initial commit: Hacker House Goa 2026 Voice Indic RAG