新增: Phase2 阶段收尾（Sprint 1-20）

重构：删 5 零引用 crate（df-evolve/plugin/stages/task/traceability）+ 清死模块、ai.rs 拆 11 子 module、ai.ts 拆 6 composable、i18n 拆目录
功能：知识库全栈（df-project/scan + CRUD + 时间线 + 前端）、Settings 拆分、appSettings KV 迁移、模型池、LLM 并发 Semaphore
修复：审批持久化根治、ConditionEngine 默认拒绝、NodeRegistry unimplemented 清除、promote 补偿删除、工具结果截断 50KB、路径校验防 symlink 逃逸
文档：B-03 人工审批设计、决策记录三分档、规格契约自检、经验记录、todo 看板、PROGRESS 更新

详见 PROGRESS.md。src-tauri/儿童每日打卡应用/ 与本项目无关，已排除。

crates/df-storage/src/models.rs

@@ -36,6 +36,10 @@ pub struct ProjectRecord {
     pub description: String,
     pub status: String,
     pub idea_id: Option<String>,
+    /// 绑定的本地代码目录(绝对路径,可空=未绑定,第二步导入历史项目时复用)
+    pub path: Option<String>,
+    /// 技术栈 JSON 数组字符串(如 ["rust","vue","tauri"],由探测填充,可空)
+    pub stack: Option<String>,
     pub created_at: String,
     pub updated_at: String,
 }
@@ -149,6 +153,10 @@ pub struct AiConversationRecord {
     pub messages: String,             // JSON array of ChatMessage
     pub provider_id: Option<String>,
     pub model: Option<String>,
+    pub models: Option<String>,             // 用过的所有 model(JSON 数组字符串,去重)
+    pub archived: bool,                 // 是否归档(侧栏折叠展示)
+    pub prompt_tokens: Option<i64>,         // 输入 token 累计(流式 usage 落库)
+    pub completion_tokens: Option<i64>,     // 输出 token 累计(流式 usage 落库)
     pub created_at: String,
     pub updated_at: String,
 }
@@ -168,3 +176,37 @@ pub struct AiToolExecutionRecord {
     pub executed_at: Option<String>,
     pub decided_by: Option<String>,   // human/auto
 }
+
+// ============================================================
+// 知识库模型 (V7)
+// ============================================================
+
+/// 知识条目记录(经验沉淀基本单元,共享记忆层)
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct KnowledgeRecord {
+    pub id: String,
+    pub kind: String,                  // KnowledgeKind snake_case(7 种)
+    pub title: String,
+    pub content: String,
+    pub tags: Option<String>,          // JSON 数组字符串
+    pub status: String,                // candidate|pending_review|published|archived
+    pub confidence: Option<String>,    // high|medium|low(AI 提炼自评,可空)
+    pub reuse_count: i32,              // 唯一客观排序信号
+    pub verified: bool,                // 发布审核时一次性人工标
+    pub source_project: Option<String>, // 来源项目(仅溯源不过滤)
+    pub source_ref: Option<String>,    // 来源实体引用(如 conv:{id})
+    pub reasoning: Option<String>,     // AI 提炼判断依据("为何值得沉淀"),手动录入为 None
+    pub created_at: String,
+    pub updated_at: String,
+}
+
+/// 知识生命线事件记录(追加型审计:产生/审核/引用/归档)
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct KnowledgeEventRecord {
+    pub id: String,
+    pub knowledge_id: String,
+    pub event_type: String,            // created | extracted | status_changed | referenced | archived
+    pub source_ref: Option<String>,    // 触发来源: conv:{id} / manual / system
+    pub context_json: Option<String>,  // JSON: 因 event_type 而异
+    pub timestamp: String,
+}