Refactor hooks and worker service for improved error handling and initialization

- Removed try-catch blocks in new-hook, save-hook, and summary-hook for cleaner flow.
- Enhanced error handling in save and summary hooks to throw errors instead of logging and returning.
- Introduced ensureWorkerRunning utility to manage worker service lifecycle and health checks.
- Replaced dynamic port allocation with a fixed port for the worker service.
- Simplified path management and removed unused port allocator utility.
- Added database schema initialization for fresh installations and improved migration handling.

ecosystem.config.cjs

@@ -31,7 +31,7 @@ module.exports = {
 
     env: {
       NODE_ENV: 'production',
-      CLAUDE_MEM_WORKER_PORT: 0, // Dynamic port allocation
+      CLAUDE_MEM_WORKER_PORT: 37777, // Fixed port for reliability
       FORCE_COLOR: '1'
     },