Refactors URL slug case sensitivity implementation:
- Moves case conversion to creation time instead of lookup
- Updates middleware to handle case sensitivity more efficiently
- Adds configuration docs for case sensitivity and list query limits
- Simplifies nanoid implementation to always use lowercase
This change improves performance and consistency in URL handling while maintaining backwards compatibility with existing links.
Improves response times by introducing a configurable link cache TTL, defaulting to 60 seconds, to ensure quick access to frequently requested links while maintaining responsiveness to updates.
