feat: Implement title caching system to reduce API calls

- Add configurable title caching with fallback support
- Cache titles for 30 minutes by default, with 24-hour fallback on API failures
- Add --no-cache and --reset-cache CLI flags for cache control
- Implement region-aware caching to handle geo-restricted content
- Use SHA256 hashing for cache keys to handle complex title IDs
- Add cache configuration variables to config system
- Document new caching options in example config

This caching system significantly reduces redundant API calls when debugging
or modifying CLI parameters, improving both performance and reliability.

unshackle/unshackle-example.yaml

@@ -15,6 +15,12 @@ update_checks: true
 # How often to check for updates, in hours (default: 24)
 update_check_interval: 24
 
+# Title caching configuration
+# Cache title metadata to reduce redundant API calls
+title_cache_enabled: true  # Enable/disable title caching globally (default: true)
+title_cache_time: 1800  # Cache duration in seconds (default: 1800 = 30 minutes)
+title_cache_max_retention: 86400  # Maximum cache retention for fallback when API fails (default: 86400 = 24 hours)
+
 # Muxing configuration
 muxing:
   set_title: false