Refactor: 统一消息格式和Session架构重构

核心改动：
- 统一所有Session内部使用Claude content-block格式
- 引入BaseSession基类，简化代码结构
- tool_results从字符串改为结构化字典列表
- NativeClaudeSession增强：支持cr_token、metadata、thinking提取
- ToolClient简化：删除structured分支，统一使用protocol prompt
- MixinSession支持按名称选择session
- ljqCtrl_sop增加DPI坐标陷阱警告

assets/tools_schema.json

@@ -46,7 +46,7 @@
     "description": "Execute JS to control browser. Use precisely to reduce web_scan calls. Put code in ```javascript blocks in reply body to avoid escaping",
     "parameters": {"type": "object", "properties": {
       "script": {"type": "string", "description": "[Mutually exclusive] JS code or script path. NEVER use this param when use reply code block"},
-      "save_to_file": {"type": "string", "description": "file path; only for long result", "default": ""},
+      "save_to_file": {"type": "string", "description": "file path; **only** for long result", "default": ""},
       "no_monitor": {"type": "boolean", "description": "Skip page change monitoring, saves 2-3s. Only for reads, not for page actions", "default": false}}}
   }},
   {"type": "function", "function": {