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.

src/bin/hooks/save-hook.ts

@@ -11,13 +11,7 @@ import { stdin } from 'process';
 let input = '';
 stdin.on('data', (chunk) => input += chunk);
 stdin.on('end', async () => {
-  try {
-    const parsed = input.trim() ? JSON.parse(input) : undefined;
-    await saveHook(parsed);
-    process.exit(0);
-  } catch (error: any) {
-    console.error(`[claude-mem save-hook error: ${error.message}]`);
-    console.log('{"continue": true, "suppressOutput": true}');
-    process.exit(0);
-  }
+  const parsed = input.trim() ? JSON.parse(input) : undefined;
+  await saveHook(parsed);
+  process.exit(0);
 });