Implement Caching for Frequent Topic Searches

[imDarshanGK]

Problem:

• Repeated searches for same topic hit API unnecessarily

Solution:

• Add Redis/file-based caching
• Cache duration: 6 hours for trending topics
• Cache key: topic + max_results

Technical Approach:

1. Use Flask-Caching
2. Add @cache.cached() decorator
3. Configurable in config.py