Add caching system for weather dataHEADmain

Implement a caching mechanism to reduce API calls and improve
performance. The cache stores weather data with configurable TTL (15
minutes default) and automatic cleanup when exceeding max entries
(50 default).

- Add cache configuration options for TTL and max entries
- Store fetched data with timestamps in hash table
- Add force refresh functionality with 'r' key binding
- Implement automatic cache cleanup to prevent unbounded growth
- Fall back to stale cache on network errors
- Also, fixed URL parameter concatenation in fetch function

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