feat: Implement Worker Service with session management and SDK integration

- Added WorkerService to handle long-running HTTP service with session management.
- Implemented endpoints for initializing, observing, finalizing, checking status, and deleting sessions.
- Integrated with Claude SDK for processing observations and generating responses.
- Added port allocator utility to dynamically find available ports for the service.
- Configured TypeScript settings for the project.

ecosystem.config.cjs

@@ -0,0 +1,56 @@
+/**
+ * PM2 Ecosystem Configuration for claude-mem Worker Service
+ *
+ * Usage:
+ *   pm2 start ecosystem.config.cjs
+ *   pm2 stop claude-mem-worker
+ *   pm2 restart claude-mem-worker
+ *   pm2 logs claude-mem-worker
+ *   pm2 status
+ */
+
+const os = require('os');
+const path = require('path');
+
+// Determine log directory
+const logDir = path.join(os.homedir(), '.claude-mem', 'logs');
+
+module.exports = {
+  apps: [{
+    name: 'claude-mem-worker',
+    script: './dist/worker-service.cjs',
+    interpreter: 'node',
+    instances: 1,
+    exec_mode: 'fork',
+    autorestart: true,
+    watch: false,
+    max_memory_restart: '500M',
+    min_uptime: '10s',
+    max_restarts: 10,
+    restart_delay: 4000,
+
+    env: {
+      NODE_ENV: 'production',
+      CLAUDE_MEM_WORKER_PORT: 0, // Dynamic port allocation
+      FORCE_COLOR: '1'
+    },
+
+    // Logging
+    error_file: path.join(logDir, 'worker-error.log'),
+    out_file: path.join(logDir, 'worker-out.log'),
+    log_date_format: 'YYYY-MM-DD HH:mm:ss.SSS Z',
+    merge_logs: true,
+
+    // Keep logs from last 7 days
+    log_type: 'json',
+
+    // Process management
+    kill_timeout: 5000,
+    listen_timeout: 10000,
+    shutdown_with_message: true,
+
+    // PM2 Plus (optional monitoring)
+    // instance_var: 'INSTANCE_ID',
+    // pmx: true
+  }]
+};