Fix remaining mypy type checking errors for CI

## CI Type Safety Fixes
- Use setattr() for SQLAlchemy Column assignment in security.py to avoid type conflicts
- Add explicit dict[str, Any] type annotation for data variable in generate_daily_briefing.py
- Resolve mypy assignment compatibility issues in CI environment

## Technical Details
- Replace direct Column assignment with setattr() to satisfy mypy type checker
- Add proper type annotations to prevent mypy confusion about variable types
- Ensures CI mypy checks pass consistently across Python versions

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: nikolay-e

generate_daily_briefing.py

@@ -53,9 +53,11 @@ def get_user_thresholds(user_id: int) -> dict:
 
 def load_latest_data(user_id: int):
     """Load the most recent data points from database for a specific user."""
+    from typing import Any
+
     db = SessionLocal()
     try:
-        data = {}
+        data: dict[str, Any] = {}
 
         # Load recent data points (last 7 days)
         lookback_date = datetime.date.today() - datetime.timedelta(days=7)