small cleanups

Added userId and date-time to the conversations.

Final application code deployment. Ensures all functionalities, including correct SYSTEM_PROMPT usage, Firestore conversation saving, and returning conversation ID in API response.

Fix: 'HEADERS' not defined error by using DEEPSEEK_HEADERS from config.py in compassia.py.

Small updates on app.py

Edited sqlite3 to ensure its accessibility.

Fix: ChromaDB SQLite version issue for Hugging Face deployment by moving pysqlite3 import to app.py. Refined doc indexing.

Small updates on the app file.

Reorganized the project: -Documents hosted on Firestore db, -conversations saved