Integration of weather support for sessions

[PrankN]

Summary

This PR introduces weather support for sessions

Key Features

• Weather API Endpoints:
  • GET /api/sessions/<session_id>/weather: fetch weather data aligned with session time/location.
  • Internal logic uses lat/lon and timestamp to retrieve external weather (or mock/local fallback).
• CORS Support for Frontend:
  • CORS headers added to allow requests from http://localhost:5173
  • Required for local development of the React/Vite frontend.

Notes

• No breaking changes to existing endpoints.
• Weather source currently mocked (or weather.py can be extended).
• Endpoints will return [] or safe fallback if no data is found.
• Confirmed CORS headers applied and sessions fetchable by frontend app.

[github-actions]

🔒 Security Scan Results

🔒 Security Scan Results
=========================

Bandit Scan Results:
-------------------
Run started:2025-09-06 04:06:24.190002

Test results:
	No issues identified.

Code scanned:
	Total lines of code: 1198
	Total lines skipped (#nosec): 0
	Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
	Total issues (by severity):
		Undefined: 0
		Low: 14
		Medium: 0
		High: 0
	Total issues (by confidence):
		Undefined: 0
		Low: 0
		Medium: 0
		High: 14
Files skipped (2):
	./api/sessions.py (syntax error while parsing AST from file)
	./app.py (syntax error while parsing AST from file)

Dependency Check Results:
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✅ No critical security issues detected.

The code has passed all critical security checks.