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.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "claude-mem",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "Memory compression system for Claude Code - persist context across sessions",
   "keywords": [
     "claude",