清理已删除的 backend/frontend/planner/storage Agent 配置及残留目录

- 删除 agents/backend/, agents/frontend/, agents/planner/, agents/storage/
- 删除 workspace-backend/, workspace-frontend/, workspace-planner/, workspace-storage/
- 更新 MEMORY.md Agent 表格（移除已删除项，补充 juaner/test-long-task）
- 新增 test-long-task Agent（identity.prompt + models.json）

agents/main/agent/models.json

@@ -408,6 +408,45 @@
           "maxTokens": 384000
         }
       ]
+    },
+    "deepseek": {
+      "baseUrl": "https://api.deepseek.com/v1",
+      "apiKey": "DEEPSEEK_API_KEY",
+      "api": "openai-completions",
+      "models": [
+        {
+          "id": "deepseek-v4-pro",
+          "name": "DeepSeek V4 Pro",
+          "reasoning": false,
+          "input": [
+            "text"
+          ],
+          "cost": {
+            "input": 1,
+            "output": 2,
+            "cacheRead": 0,
+            "cacheWrite": 0
+          },
+          "contextWindow": 1000000,
+          "maxTokens": 384000
+        },
+        {
+          "id": "deepseek-v4-flash",
+          "name": "DeepSeek V4 Flash",
+          "reasoning": false,
+          "input": [
+            "text"
+          ],
+          "cost": {
+            "input": 1,
+            "output": 2,
+            "cacheRead": 0,
+            "cacheWrite": 0
+          },
+          "contextWindow": 1000000,
+          "maxTokens": 384000
+        }
+      ]
     }
   }
 }