Upgrade to Python 3.12 and latest dependencies

[omerXfaruq]

Major upgrades:

• Python: 3.10 → 3.12
• FastAPI: 0.70.1 → 0.121.3
• Pydantic: 1.8.2 → 2.12.4 (v1 → v2 migration)
• SQLAlchemy: 1.4.28 → 2.0.44
• SQLModel: 0.0.4 → 0.0.27
• Uvicorn: 0.16.0 → 0.38.0
• All other dependencies upgraded to latest versions

Code changes:

• Migrated from deprecated asyncio.get_event_loop() to asyncio.run()
• Replaced @app.on_event('startup') with lifespan context manager
• Updated Pydantic v1 API to v2:
  • .dict() → .model_dump()
  • .from_orm() → .model_validate()
• Fixed Pydantic v2 validation issues:
  • Added default None to all Optional fields
  • Added ConfigDict(extra='ignore') to handle Telegram's extra fields
  • Fixed type mismatches (message_id: str→int, is_bot: str→bool)
• Removed built-in modules from requirements (asyncio, typing, datetime)
• Added missing dependencies (yfinance, pytest-asyncio)
• Optimized pyngrok import to be conditional

Testing:

• Refactored test suite into organized classes (55 unit tests)
• Added comprehensive E2E test suite (16 tests)
• Fixed pre-existing test bugs
• All 71 tests passing

Documentation:

• Updated repro.md with Python 3.12 and venv instructions
• Added .gitignore for venv and common files
• Added run_locally.sh script (uses environment variables for tokens)

Infrastructure:

• Created Python 3.12 virtual environment
• Updated requirements.in and requirements.txt
• All code compatible with Python 3.12 and latest packages