refactor: resolve pylint errors and warnings across api and src routers

chore: codebase audit and fixes (ruff, mypy, pytest)

Fix codebase issues: linting, types, tests, and security.

fix: all 15 bugs + full agentic RAG pipeline in HF Space

Production Upgrade v2.0: SSE streaming, HIPAA compliance, Gradio Q&A UI

feat: Enable 100% HF Space capability with dynamic environment variables

Fix: Dynamic API key loading - secrets now work properly on HuggingFace Spaces

feat: production upgrade — agentic RAG, OpenSearch, Redis, Langfuse, Docker, Gradio, Telegram

Refactor: Improve code quality, security, and configuration

docs: update all documentation to reflect current codebase state

refactor: major repository cleanup and bug fixes