新增: 知识图谱Phase2事件流(父⑥) — project_events统一事件流+埋点+timeline

父⑥ Phase 2(对标设计 §2.4):
- V30 迁移:project_events 追加型审计表(id/project_id/event_type/entity_type/entity_id/from_state/to_state/context_json/source/conversation_id/created_at)+ 双索引(project,time / entity)
- ProjectEventRecord + ProjectEventRepo(insert 追加型/get_by_project/get_by_entity/list_recent)
- 事件埋点(best-effort,hook/after,失败 warn 不阻断主操作):
  - task.rs emit_event 辅助 + create_task/advance_task/move_task_queue 埋点
  - idea.rs promote_idea 埋点(idea_promoted,project_id=新项目)
  - project.rs create/delete 埋点
  - 注:idea_created 暂不埋点(idea 无 project_id,待 Inbox 项目落地,NOT NULL+FK 约束)
- get_project_timeline IPC(events 模块)+ lib.rs 注册 + AI 工具(基线 +N)
- source 语义:IPC 标 human,AI 工具路径标 ai

注:workflow 脚本中文变量名 const 致验证 agent 未跑,主控独立 cargo check EXIT 0 + grep 落地齐全核验。

crates/df-storage/src/crud/mod.rs

@@ -7,6 +7,7 @@
 //! - [`mod@project_repo`]:ProjectRepo/BranchRepo/ReleaseRepo/WorkflowRepo/NodeExecutionRepo
 //! - [`mod@task_repo`]:TaskRepo(含 advance_status_atomic 状态机收口)
 //! - [`mod@task_link_repo`]:TaskLinkRepo(任务横向关联 task_links,V29,知识图谱 Phase 1)
+//! - [`mod@project_event_repo`]:ProjectEventRepo(统一事件流 project_events,V30,知识图谱 Phase 2)
 //! - [`mod@conversation_repo`]:AiProviderRepo/AiConversationRepo/AiToolExecutionRepo
 //! - [`mod@idea_repo`]:IdeaRepo/KnowledgeRepo/KnowledgeEventsRepo + 向量工具
 //! - [`mod@idea_eval_repo`]:IdeaEvalRepo(灵感评估历史追加型审计表 idea_evaluations,V22)
@@ -19,6 +20,7 @@ mod conversation_repo;
 mod idea_eval_repo;
 mod idea_repo;
 mod message_repo;
+mod project_event_repo;
 mod project_repo;
 mod settings;
 mod task_link_repo;
@@ -28,6 +30,7 @@ pub use conversation_repo::*;
 pub use idea_eval_repo::*;
 pub use idea_repo::*;
 pub use message_repo::*;
+pub use project_event_repo::*;
 pub use project_repo::*;
 pub use settings::*;
 pub use task_link_repo::*;
@@ -297,6 +300,7 @@ mod baseline_tests {
         let _ = ProjectRepo::new(&db);
         let _ = TaskRepo::new(&db);
         let _ = TaskLinkRepo::new(&db);
+        let _ = ProjectEventRepo::new(&db);
         let _ = BranchRepo::new(&db);
         let _ = ReleaseRepo::new(&db);
         let _ = WorkflowRepo::new(&db);