refactor: defaultTemperature/defaultTopP 从 Provider 级别迁移到 Model 级别

- 删除所有 Provider 顶层的 defaultTemperature / defaultTopP
- 为所有对话类模型添加 model 级别的推荐温度参数（基于官方文档）
- volcengine：将 extra 内温度参数提升到模型顶层正式字段
- presetDataVersion 7→8

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

compute/providers/zhipu.json

@@ -15,8 +15,6 @@
     "reasoning",
     "embedding"
   ],
-  "defaultTemperature": 0.95,
-  "defaultTopP": 0.7,
   "models": [
     {
       "modelName": "glm-5",
@@ -38,6 +36,8 @@
       ],
       "inputPrice": 4,
       "outputPrice": 18,
+      "defaultTemperature": 0.95,
+      "defaultTopP": 0.7,
       "extra": {}
     },
     {
@@ -58,6 +58,8 @@
       ],
       "inputPrice": 4,
       "outputPrice": 16,
+      "defaultTemperature": 0.95,
+      "defaultTopP": 0.7,
       "extra": {}
     },
     {
@@ -76,6 +78,8 @@
       ],
       "inputPrice": 8,
       "outputPrice": 32,
+      "defaultTemperature": 0.95,
+      "defaultTopP": 0.7,
       "extra": {}
     },
     {