Add caching layer for improved API performance

[RajuSinghRaj]

Objective:
Introduce a caching layer to improve API performance and reduce repeated processing for frequently accessed endpoints.

Scope:

• Integrate Flask-Caching into the backend
• Configure application-level caching
• Apply caching to appropriate API endpoints
• Ensure cached responses reduce redundant processing

Implementation:

• Installed and configured Flask-Caching
• Added caching configuration in app initialization
• Applied caching decorator to selected API endpoints
• Verified endpoint responses remain consistent

Acceptance Criteria:

• Caching layer successfully integrated
• Cached responses returned for repeated requests
• No breaking changes introduced
• API performance improved for repeated calls