* Remove unused STATIC_CONFIG and LIBRECHAT_YAML_CONFIG cache keys.
These cache keys were identified as dead code - they were being written to but never read from anywhere in the codebase after a recent refactor:
- STATIC_CONFIG was used as a cache namespace that stored configuration data
- LIBRECHAT_YAML_CONFIG was the key used within that namespace to store parsed YAML config
- The cache.set() operation in loadCustomConfig.js stored the config but no cache.get() operations retrieved it
- Configuration data is already handled through other mechanisms without caching
* # removed tests regarding cache
8d6cb5eee0