feat(dashscope): 更新 Coding Plan 模型 + 新增 Token Plan + providers 补充 qwen-image 系列

Coding Plan:
- 更新模型列表至最新（qwen3.6-plus、kimi-k2.5、glm-5 等 9 个模型）
- 修正上下文窗口参数（qwen3.6-plus: 1M, glm-5: 200K 等）
- label 从 "Token (Coding) Plan" 改回 "Coding Plan"

Token Plan（新增）:
- 新增 dashscope-token-plan.json 配置
- baseUrl: token-plan.cn-beijing.maas.aliyuncs.com/compatible-mode/v1
- 包含文本模型 4 个 + 图像模型 4 个（wan2.7 + qwen-image-2.0）
- accessMode: "token-plan"，usageTracking: credits

Providers (dashscope.json):
- 补充 qwen-image-2.0-pro 和 qwen-image-2.0 两个图像生成模型

compute/providers/dashscope.json

@@ -562,6 +562,56 @@
         "supportsNegativePrompt": true
       }
     },
+    {
+      "modelName": "qwen-image-2.0-pro",
+      "displayName": "千问图像 2.0 Pro",
+      "serviceType": [
+        "image_gen"
+      ],
+      "description": "千问图像生成 2.0 Pro 旗舰版，高画质多风格",
+      "capabilities": [
+        "image_generation",
+        "chinese_optimized",
+        "high_quality"
+      ],
+      "extra": {
+        "endpoint": "/services/aigc/image-generation/generation",
+        "asyncHeader": "X-DashScope-Async",
+        "taskQueryEndpoint": "/tasks",
+        "supportedImageSizes": [
+          "512*512",
+          "1024*1024",
+          "1280*1280",
+          "1664*928",
+          "928*1664"
+        ],
+        "maxN": 4
+      }
+    },
+    {
+      "modelName": "qwen-image-2.0",
+      "displayName": "千问图像 2.0",
+      "serviceType": [
+        "image_gen"
+      ],
+      "description": "千问图像生成 2.0 标准版",
+      "capabilities": [
+        "image_generation",
+        "chinese_optimized"
+      ],
+      "extra": {
+        "endpoint": "/services/aigc/image-generation/generation",
+        "asyncHeader": "X-DashScope-Async",
+        "taskQueryEndpoint": "/tasks",
+        "supportedImageSizes": [
+          "512*512",
+          "1024*1024",
+          "1280*1280",
+          "2048*2048"
+        ],
+        "maxN": 4
+      }
+    },
     {
       "modelName": "wan2.6-t2v",
       "displayName": "通义万相 2.6 文生视频",