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/utils/path-resolver.ts

@@ -195,15 +195,6 @@ export function ensureDir(dirPath: string): void {
   }
 }
 
-/**
- * Get the .workflow directory path from project path
- * @param projectPath - Path to project
- * @returns Path to .workflow directory
- */
-export function getWorkflowDir(projectPath: string): string {
-  return join(resolvePath(projectPath), '.workflow');
-}
-
 /**
  * Normalize path for display (handle Windows backslashes)
  * @param filePath - Path to normalize