feat: 添加YAML智能解析支持到容错JSON解析器

修复tolerant_json_parser无法处理retrievedContext.text中YAML结构的问题
 新增process_yaml_in_json_value方法，递归检查JSON字符串字段中的YAML内容
 即使标准JSON解析成功，也会自动检测并解析YAML字符串字段
 添加YamlStringParsing恢复策略，提供详细的解析统计信息
 更新前端功能特性描述，添加YAML支持说明
 新增完整的测试用例验证YAML解析功能
 支持复杂的YAML嵌套结构、数组和对象解析
 遵循promptx/tauri-desktop-app-expert开发规范

apps/desktop/src-tauri/Cargo.toml

@@ -24,6 +24,7 @@ tauri-plugin-fs = "2"
 tauri-plugin-dialog = "2"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
+serde_yaml = "0.9"
 rusqlite = { version = "0.31", features = ["bundled", "chrono"] }
 chrono = { version = "0.4", features = ["serde"] }
 uuid = { version = "1.0", features = ["v4", "serde"] }