feat(ai): Phase 3A RAG 知识库 — CRUD API + Agent Tool + 向量知识源 + 前端管理页

- 知识库 REST API: 10 个端点 (references/guides CRUD + re-embed)
- search_medical_knowledge Agent Tool: 语义检索参考资料和临床指南
- VectorKnowledgeSource: 实现 KnowledgeSource trait，自动降级
- 沙箱配置: Patient/MedicalStaff 允许使用知识库检索
- 前端 AiKnowledgePage: Tabs(参考资料/临床指南) + Table + Modal CRUD
- 权限码 seed 迁移: ai.knowledge.list + ai.knowledge.manage + 菜单

crates/erp-ai/src/agent/sandbox.rs

@@ -44,6 +44,7 @@ pub fn get_sandbox_config(role: &UserRole) -> SandboxConfig {
                 "query_patient_vitals".into(),
                 "query_patient_lab_reports".into(),
                 "query_patient_medications".into(),
+                "search_medical_knowledge".into(),
             ]),
             system_prompt_suffix: PATIENT_PROMPT_SUFFIX,
             output_filter: OutputFilter {
@@ -59,6 +60,7 @@ pub fn get_sandbox_config(role: &UserRole) -> SandboxConfig {
                 "query_patient_lab_reports".into(),
                 "query_patient_appointments".into(),
                 "query_patient_medications".into(),
+                "search_medical_knowledge".into(),
             ]),
             system_prompt_suffix: MEDICAL_STAFF_PROMPT_SUFFIX,
             output_filter: OutputFilter {

crates/erp-ai/src/agent/tools/mod.rs

@@ -4,8 +4,10 @@ pub mod query_appointments;
 pub mod query_lab_reports;
 pub mod query_medications;
 pub mod query_vitals;
+pub mod search_medical_knowledge;
 
 pub use query_appointments::QueryAppointmentsTool;
 pub use query_lab_reports::QueryLabReportsTool;
 pub use query_medications::QueryMedicationsTool;
 pub use query_vitals::QueryPatientVitalsTool;
+pub use search_medical_knowledge::SearchMedicalKnowledgeTool;

crates/erp-ai/src/agent/tools/search_medical_knowledge.rs

@@ -0,0 +1,112 @@
+use async_trait::async_trait;
+
+use crate::agent::tool::{AgentTool, ToolContext, ToolResult};
+use crate::service::embedding::EmbeddingService;
+
+/// 语义检索医学知识库（参考资料 + 临床指南）
+pub struct SearchMedicalKnowledgeTool;
+
+#[async_trait]
+impl AgentTool for SearchMedicalKnowledgeTool {
+    fn name(&self) -> &str {
+        "search_medical_knowledge"
+    }
+
+    fn description(&self) -> &str {
+        "在医学知识库中语义检索相关参考资料和临床指南。输入查询文本，返回最相关的知识条目。可选按分析类型过滤（如 trend、lab_report、dialysis_risk）。"
+    }
+
+    fn parameters_schema(&self) -> serde_json::Value {
+        serde_json::json!({
+            "type": "object",
+            "required": ["query"],
+            "properties": {
+                "query": {
+                    "type": "string",
+                    "description": "搜索查询文本，如'高血压管理指南'或'血红蛋白偏低原因'"
+                },
+                "analysis_type": {
+                    "type": "string",
+                    "description": "可选：按分析类型过滤（trend、lab_report、dialysis_risk 等）"
+                }
+            }
+        })
+    }
+
+    async fn execute(&self, ctx: &ToolContext, params: serde_json::Value) -> ToolResult {
+        let query_text = match params["query"].as_str() {
+            Some(q) if !q.trim().is_empty() => q.to_string(),
+            _ => {
+                return ToolResult {
+                    output: "请提供搜索查询文本".to_string(),
+                    display_hint: None,
+                };
+            }
+        };
+
+        let analysis_type = params["analysis_type"].as_str();
+
+        let embedding_svc = EmbeddingService::from_settings(&ctx.db).await;
+
+        if !embedding_svc.is_configured() {
+            return ToolResult {
+                output: "Embedding API 未配置，无法进行语义搜索".to_string(),
+                display_hint: None,
+            };
+        }
+
+        let embedding = match embedding_svc.embed(&query_text).await {
+            Ok(e) => e,
+            Err(e) => {
+                return ToolResult {
+                    output: format!("生成查询向量失败: {}", e),
+                    display_hint: None,
+                };
+            }
+        };
+
+        let results = match crate::knowledge::vector_search::KnowledgeSearchRepository::search(
+            &ctx.db,
+            ctx.tenant_id,
+            analysis_type,
+            &embedding,
+            5,
+            0.6,
+        )
+        .await
+        {
+            Ok(r) => r,
+            Err(e) => {
+                return ToolResult {
+                    output: format!("知识库搜索失败: {}", e),
+                    display_hint: None,
+                };
+            }
+        };
+
+        if results.is_empty() {
+            return ToolResult {
+                output: "未找到相关的医学知识条目".to_string(),
+                display_hint: None,
+            };
+        }
+
+        let mut output = String::from("知识库检索结果：\n\n");
+        for (i, r) in results.iter().enumerate() {
+            output.push_str(&format!(
+                "{}. [{}] {}（相似度: {}%）\n   来源: {}\n   {}\n\n",
+                i + 1,
+                r.source_table,
+                r.title,
+                (r.similarity * 100.0) as u32,
+                r.source_name,
+                r.content.chars().take(200).collect::<String>(),
+            ));
+        }
+
+        ToolResult {
+            output,
+            display_hint: None,
+        }
+    }
+}