feat(storage): implement storage manager for centralized management and cleanup

- Added a new Storage Manager component to handle storage statistics, project cleanup, and configuration for CCW centralized storage.
- Introduced functions to calculate directory sizes, get project storage stats, and clean specific or all storage.
- Enhanced SQLiteStore with a public API for executing queries securely.
- Updated tests to utilize the new execute_query method and validate storage management functionalities.
- Improved performance by implementing connection pooling with idle timeout management in SQLiteStore.
- Added new fields (token_count, symbol_type) to the symbols table and adjusted related insertions.
- Enhanced error handling and logging for storage operations.

ccw/src/core/cache-manager.ts

@@ -29,8 +29,11 @@ export class CacheManager<T> {
    * @param options - Cache configuration options
    */
   constructor(cacheKey: string, options: CacheOptions = {}) {
+    if (!options.cacheDir) {
+      throw new Error('CacheManager requires cacheDir option. Use StoragePaths.project(path).cache');
+    }
     this.ttl = options.ttl || 5 * 60 * 1000; // Default: 5 minutes
-    this.cacheDir = options.cacheDir || '.ccw-cache';
+    this.cacheDir = options.cacheDir;
     this.cacheFile = join(this.cacheDir, `${cacheKey}.json`);
   }