feat(knowledge): Phase D 统一搜索 + 种子知识冷启动

- search/recommend API 返回 UnifiedSearchResult (文档+结构化双通道)
- POST /api/v1/knowledge/seed 种子知识冷启动 (幂等, admin权限)
- seed_knowledge service: 按标题+行业查重, source=distillation
- SearchRequest 扩展: search_structured/search_documents/industry_id

crates/zclaw-saas/src/knowledge/handlers.rs

@@ -374,21 +374,17 @@ pub async fn rollback_version(
 
 // === 检索 ===
 
-/// POST /api/v1/knowledge/search — 语义搜索
+/// POST /api/v1/knowledge/search — 统一搜索（双通道：文档 + 结构化）
 pub async fn search(
     State(state): State<AppState>,
     Extension(ctx): Extension<AuthContext>,
     Json(req): Json<SearchRequest>,
-) -> SaasResult<Json<Vec<SearchResult>>> {
+) -> SaasResult<Json<UnifiedSearchResult>> {
     check_permission(&ctx, "knowledge:search")?;
-    let limit = req.limit.unwrap_or(5).min(10);
-    let min_score = req.min_score.unwrap_or(0.5);
-    let results = service::search(
+    let results = service::unified_search(
         &state.db,
-        &req.query,
-        req.category_id.as_deref(),
-        limit,
-        min_score,
+        &req,
+        Some(&ctx.account_id),
     ).await?;
     Ok(Json(results))
 }
@@ -398,15 +394,15 @@ pub async fn recommend(
     State(state): State<AppState>,
     Extension(ctx): Extension<AuthContext>,
     Json(req): Json<SearchRequest>,
-) -> SaasResult<Json<Vec<SearchResult>>> {
+) -> SaasResult<Json<UnifiedSearchResult>> {
     check_permission(&ctx, "knowledge:search")?;
-    let limit = req.limit.unwrap_or(5).min(10);
-    let results = service::search(
+    let mut req = req;
+    req.min_score = Some(0.3);
+    req.search_structured = req.search_structured.or(Some(true));
+    let results = service::unified_search(
         &state.db,
-        &req.query,
-        req.category_id.as_deref(),
-        limit,
-        0.3,
+        &req,
+        Some(&ctx.account_id),
     ).await?;
     Ok(Json(results))
 }
@@ -885,3 +881,34 @@ async fn handle_structured_upload(
         _ => Err(SaasError::InvalidInput("意外的处理结果".into())),
     }
 }
+
+// === 种子知识冷启动 ===
+
+/// POST /api/v1/knowledge/seed — 触发种子知识冷启动
+///
+/// 需要 admin 权限，幂等（按标题+行业查重）
+pub async fn seed_knowledge(
+    State(state): State<AppState>,
+    Extension(ctx): Extension<AuthContext>,
+    Json(req): Json<SeedKnowledgeRequest>,
+) -> SaasResult<Json<serde_json::Value>> {
+    check_permission(&ctx, "knowledge:admin")?;
+
+    if req.items.len() > 100 {
+        return Err(SaasError::InvalidInput("单次种子不能超过 100 条".into()));
+    }
+
+    let created = service::seed_knowledge(
+        &state.db,
+        &req.industry_id,
+        req.category_id.as_deref().unwrap_or("seed"),
+        &req.items.iter().map(|i| (i.title.clone(), i.content.clone(), i.keywords.clone().unwrap_or_default())).collect::<Vec<_>>(),
+        &ctx.account_id,
+    ).await?;
+
+    Ok(Json(serde_json::json!({
+        "industry_id": req.industry_id,
+        "created_count": created,
+        "total_submitted": req.items.len(),
+    })))
+}

crates/zclaw-saas/src/knowledge/mod.rs

@@ -32,6 +32,7 @@ pub fn routes() -> axum::Router<crate::state::AppState> {
         // 检索
         .route("/api/v1/knowledge/search", post(handlers::search))
         .route("/api/v1/knowledge/recommend", post(handlers::recommend))
+        .route("/api/v1/knowledge/seed", post(handlers::seed_knowledge))
         // 分析看板
         .route("/api/v1/knowledge/analytics/overview", get(handlers::analytics_overview))
         .route("/api/v1/knowledge/analytics/trends", get(handlers::analytics_trends))

crates/zclaw-saas/src/knowledge/service.rs

@@ -582,6 +582,113 @@ pub async fn search(
     }).filter(|r| r.score >= min_score).collect())
 }
 
+// === 统一搜索（双通道合并） ===
+
+/// 统一搜索：同时检索文档通道和结构化通道
+pub async fn unified_search(
+    pool: &PgPool,
+    request: &SearchRequest,
+    viewer_account_id: Option<&str>,
+) -> SaasResult<UnifiedSearchResult> {
+    let limit = request.limit.unwrap_or(5).min(10);
+    let search_docs = request.search_documents.unwrap_or(true);
+    let search_struct = request.search_structured.unwrap_or(true);
+
+    // 文档通道
+    let documents = if search_docs {
+        search(
+            pool,
+            &request.query,
+            request.category_id.as_deref(),
+            limit,
+            request.min_score.unwrap_or(0.5),
+        ).await?
+    } else {
+        Vec::new()
+    };
+
+    // 结构化通道
+    let structured = if search_struct {
+        query_structured(
+            pool,
+            &StructuredQueryRequest {
+                query: request.query.clone(),
+                source_id: None,
+                industry_id: request.industry_id.clone(),
+                limit: Some(limit),
+            },
+            viewer_account_id,
+        ).await?
+    } else {
+        Vec::new()
+    };
+
+    Ok(UnifiedSearchResult {
+        documents,
+        structured,
+    })
+}
+
+// === 种子知识冷启动 ===
+
+/// 为指定行业插入种子知识（幂等）
+pub async fn seed_knowledge(
+    pool: &PgPool,
+    industry_id: &str,
+    category_id: &str,
+    items: &[(String, String, Vec<String>)], // (title, content, keywords)
+    system_account_id: &str,
+) -> SaasResult<usize> {
+    let mut created = 0;
+    for (title, content, keywords) in items {
+        if content.trim().is_empty() {
+            continue;
+        }
+        // 幂等：按标题 + source='distillation' + tags 含行业ID 查重
+        let exists: (i64,) = sqlx::query_as(
+            "SELECT COUNT(*) FROM knowledge_items \
+             WHERE title = $1 AND source = 'distillation' \
+             AND $2 = ANY(tags)"
+        )
+        .bind(title)
+        .bind(format!("industry:{}", industry_id))
+        .fetch_one(pool)
+        .await?;
+
+        if exists.0 > 0 {
+            continue;
+        }
+
+        let id = uuid::Uuid::new_v4().to_string();
+        let now = chrono::Utc::now();
+        let kw_json = serde_json::to_value(keywords).unwrap_or(serde_json::json!([]));
+        let tags = vec![
+            format!("industry:{}", industry_id),
+            "source:distillation".to_string(),
+        ];
+
+        sqlx::query(
+            "INSERT INTO knowledge_items \
+             (id, category_id, title, content, keywords, status, priority, visibility, account_id, source, tags, version, created_by, created_at, updated_at) \
+             VALUES ($1, $8, $2, $3, $4, 'active', 5, 'public', NULL, \
+                     'distillation', $5, 1, $6, $7, $7)"
+        )
+        .bind(&id)
+        .bind(title)
+        .bind(content)
+        .bind(&kw_json)
+        .bind(&tags)
+        .bind(system_account_id)
+        .bind(&now)
+        .bind(category_id)
+        .execute(pool)
+        .await?;
+
+        created += 1;
+    }
+    Ok(created)
+}
+
 // === 分析 ===
 
 /// 分析总览

crates/zclaw-saas/src/knowledge/types.rs

@@ -331,3 +331,19 @@ pub struct StructuredQueryResult {
     pub total_matched: i64,
     pub generated_sql: Option<String>,
 }
+
+// === 种子知识 ===
+
+#[derive(Debug, Deserialize)]
+pub struct SeedKnowledgeRequest {
+    pub industry_id: String,
+    pub category_id: Option<String>,
+    pub items: Vec<SeedKnowledgeItem>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct SeedKnowledgeItem {
+    pub title: String,
+    pub content: String,
+    pub keywords: Option<Vec<String>>,
+}