feat: implement pass_mgr, pcexec, and safe-restart modules

- Add pass_mgr Go binary with AES-256-GCM encryption
- Add pcexec TypeScript tool with password sanitization
- Add safe-restart module with state machine and API
- Add slash command handler with cooldown support
- Update README with usage documentation

safe-restart/package.json

@@ -0,0 +1,25 @@
+{
+  "name": "safe-restart",
+  "version": "0.1.0",
+  "description": "Safe restart module for OpenClaw agents",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "dev": "tsc --watch",
+    "test": "jest"
+  },
+  "dependencies": {
+    "@types/node": "^20.0.0",
+    "express": "^4.18.0",
+    "ws": "^8.14.0"
+  },
+  "devDependencies": {
+    "typescript": "^5.0.0",
+    "@types/express": "^4.17.0",
+    "@types/ws": "^8.5.0",
+    "jest": "^29.0.0",
+    "@types/jest": "^29.0.0",
+    "ts-jest": "^29.0.0"
+  }
+}