feat: add code agent sandbox skeleton

config.json

@@ -716,6 +716,55 @@
         "integrated": false
       }
     },
+    {
+      "id": "code-agent-sandbox",
+      "name": "Code Agent Sandbox",
+      "providerId": "main-server",
+      "description": "独立 Code Agent Sandbox 微服务骨架，承载 Codex/OpenCode/未来 agent 的统一状态机、adapter 契约、模式边界和凭证分发语义；当前不依赖 Code Queue。",
+      "repository": {
+        "url": "https://github.com/pikasTech/unidesk",
+        "commitId": "local",
+        "dockerfile": "src/components/microservices/code-agent-sandbox/Dockerfile",
+        "composeFile": "docker-compose.yml",
+        "composeService": "code-agent-sandbox",
+        "containerName": "code-agent-sandbox-backend"
+      },
+      "backend": {
+        "nodeBaseUrl": "http://code-agent-sandbox:4260",
+        "nodeBindHost": "code-agent-sandbox",
+        "nodePort": 4260,
+        "proxyMode": "unidesk-direct",
+        "frontendOnly": true,
+        "public": false,
+        "allowedMethods": [
+          "GET",
+          "HEAD",
+          "POST",
+          "PUT"
+        ],
+        "allowedPathPrefixes": [
+          "/health",
+          "/diagnostics",
+          "/trace",
+          "/logs",
+          "/api/"
+        ],
+        "healthPath": "/health",
+        "timeoutMs": 10000
+      },
+      "development": {
+        "providerId": "main-server",
+        "sshPassthrough": false,
+        "worktreePath": "/root/unidesk/src/components/microservices/code-agent-sandbox"
+      },
+      "frontend": {
+        "route": "/apps/code-agent-sandbox",
+        "integrated": false
+      },
+      "deployment": {
+        "mode": "internal-sidecar"
+      }
+    },
     {
       "id": "mdtodo",
       "name": "MDTODO",