fix(audit): P0 反思引擎 LLM 接入 + P1 hand run_id/skill triggers/pipeline v2

审计修复 Batch 1 (M4-02/M3-01/M5-01/M6-02):

P0 M4-02: reflection_reflect 从 KernelState 获取 LLM driver
  - 新增 kernel_state 参数，从 kernel.driver() 获取驱动
  - 自动路径(post_conversation_hook)已正常，手动 Tauri 命令路径已修复

P1 M3-01: hand_execute 返回 run_id 给前端
  - HandResult 新增 run_id 字段
  - execute_hand 结果包含 run_id.to_string()

P1 M5-01: skill-discovery 使用后端 triggers 字段
  - BackendSkillInfo 新增 triggers 字段
  - convertFromBackend 优先使用 triggers，fallback tags

P1 M6-02: pipeline_list 支持 v2 YAML 格式
  - scan_pipelines_with_paths 增加 v2 fallback 解析
  - 新增 pipeline_v2_to_info 转换函数
  - discovery.rs 导入 parse_pipeline_v2_yaml

注: M4-01 双数据库问题已在之前批次修复
     M6-01 route_intent 已确认注册，审计结论过时

desktop/src/lib/skill-discovery.ts

@@ -41,6 +41,7 @@ interface BackendSkillInfo {
   version: string;
   capabilities: string[];
   tags: string[];
+  triggers: string[];
   mode: string;
   enabled: boolean;
 }
@@ -113,10 +114,10 @@ export class SkillDiscoveryEngine {
       name: backend.name,
       description: backend.description,
       version: backend.version,
-      triggers: backend.tags, // Use tags as triggers
+      triggers: backend.triggers?.length ? backend.triggers : backend.tags,
       capabilities: backend.capabilities,
       mode: backend.mode,
-      toolDeps: [], // Backend doesn't have this field
+      toolDeps: [],
       installed: backend.enabled,
       category: backend.tags[0] || 'general',
     };