chore: remove unused cache.py file

File was identified as unused with no external references in the codebase.

This cleanup reduces codebase clutter and potential confusion.

cache.py

@@ -1,43 +0,0 @@
-# In-memory cache for Filevine projects
-import threading
-import time
-from datetime import datetime, timedelta
-
-class ProjectCache:
-    def __init__(self):
-        self._cache = {}
-        self._lock = threading.Lock()
-        self._last_updated = None
-        self._is_updating = False
-
-    def get_projects(self):
-        """Get cached projects if they exist and are not expired (15 minutes)"""
-        with self._lock:
-            if not self._cache or not self._last_updated:
-                return None
-
-            # Check if cache is older than 15 minutes
-            if datetime.now() - self._last_updated > timedelta(minutes=15):
-                return None
-
-            return self._cache.copy()
-
-    def set_projects(self, projects):
-        print(f"Caching new projects: {len(projects)}")
-        """Set projects in cache with current timestamp"""
-        with self._lock:
-            self._cache = projects.copy() if projects else {}
-            self._last_updated = datetime.now()
-
-    def is_updating(self):
-        """Check if cache is currently being updated"""
-        with self._lock:
-            return self._is_updating
-
-    def set_updating(self, updating):
-        """Set the updating status"""
-        with self._lock:
-            self._is_updating = updating
-
-# Global cache instance
-project_cache = ProjectCache()