feat(cache): Implement unified caching subsystem with decorators, strategies, and management

- Added core caching functionality with `Cache` class supporting in-memory and file-based caching.
- Introduced `CacheManager` for high-level cache operations and statistics.
- Created various cache key generation strategies: `FilepathMethodStrategy`, `APIRequestStrategy`, `SimpleKeyStrategy`, and `CustomStrategy`.
- Developed decorators for easy method caching: `cached`, `cached_method`, `cached_api`, and `cached_property`.
- Implemented type definitions for cache entries and statistics.
- Added comprehensive tests for cache operations, strategies, and decorators to ensure functionality and backward compatibility.

renamer/screens.py

@@ -60,6 +60,7 @@ ACTIONS:
 • p: Expand/Collapse - Toggle expansion of selected directory
 • m: Toggle Mode - Switch between technical and catalog display modes
 • ctrl+s: Settings - Open settings window
+• ctrl+p: Command Palette - Access cache commands and more
 • h: Help - Show this help screen
 • q: Quit - Exit the application
 
@@ -338,7 +339,7 @@ Configure application settings.
             self.app.settings.set("cache_ttl_extractors", ttl_extractors)  # type: ignore
             self.app.settings.set("cache_ttl_tmdb", ttl_tmdb)  # type: ignore
             self.app.settings.set("cache_ttl_posters", ttl_posters)  # type: ignore
-            
+
             self.app.notify("Settings saved!", severity="information", timeout=2)  # type: ignore
         except ValueError:
             self.app.notify("Invalid TTL values. Please enter numbers only.", severity="error", timeout=3)  # type: ignore