新增: MCP HTTP transport + 系统托盘 + 实体解析(会话前基线收尾)

- df-mcp 加 streamable HTTP transport 层(axum 0.7 + tower,server_http.rs),lib.rs pub mod 接线

- src-tauri 加 mcp.rs(spawn_mcp_http + mcp_get_status IPC + mcp-server CLI)+ tray.rs(系统托盘 show_main/setup_tray),lib.rs 集成 + main.rs mcp-server 参数路由

- AI 工具加 entity_resolve.rs(实体解析,tools/mod.rs pub mod 接线)

crates/df-mcp/src/server.rs

@@ -23,9 +23,9 @@ use crate::protocol::{
 use crate::tools::{self, Ctx, RiskLevel};
 
 /// 协议版本(MCP 2025-06-18)
-const PROTOCOL_VERSION: &str = "2025-06-18";
-const SERVER_NAME: &str = "devflow-mcp";
-const SERVER_VERSION: &str = env!("CARGO_PKG_VERSION");
+pub(crate) const PROTOCOL_VERSION: &str = "2025-06-18";
+pub(crate) const SERVER_NAME: &str = "devflow-mcp";
+pub(crate) const SERVER_VERSION: &str = env!("CARGO_PKG_VERSION");
 
 /// 启动 MCP server。
 ///
@@ -79,7 +79,7 @@ where
             Err(e) => {
                 // 解析失败:无 id 时无法回响应,只能 log;有 id(尽力猜)回 PARSE_ERROR
                 tracing::warn!(target: "df_mcp", line = %trimmed, err = %e, "解析 JSON-RPC 行失败");
-                let resp = Response::err(None, crate::protocol::PARSE_ERROR, "Parse error", None);
+                let resp = Response::err(Some(Value::Null), crate::protocol::PARSE_ERROR, "Parse error", None);
                 write_response(&mut writer, &resp).await?;
                 continue;
             }
@@ -111,7 +111,8 @@ where
 /// 方法分发 → 构造 Response。
 ///
 /// `id`:JSON-RPC 请求 id(回响应时原样回填;通知由 main_loop 已过滤)。
-async fn dispatch(ctx: &Ctx, read_only: bool, id: Option<Value>, method: McpMethod) -> Response {
+/// `pub(crate)`:stdio(main_loop)与 HTTP(server_http)transport 共用。
+pub(crate) async fn dispatch(ctx: &Ctx, read_only: bool, id: Option<Value>, method: McpMethod) -> Response {
     match method {
         McpMethod::Initialize { .. } => {
             let result = InitializeResult {
@@ -135,9 +136,10 @@ async fn dispatch(ctx: &Ctx, read_only: bool, id: Option<Value>, method: McpMeth
         }
         McpMethod::ToolsList => {
             let tools: Vec<_> = tools::all_tools()
-                .into_iter()
+                .iter()
                 .filter(|t| visible(read_only, t.risk))
                 .map(|t| serde_json::to_value(&t.tool).unwrap_or(Value::Null))
+                .filter(|v| !v.is_null())
                 .collect();
             Response::ok(id, json!({ "tools": tools }))
         }
@@ -180,7 +182,7 @@ async fn dispatch(ctx: &Ctx, read_only: bool, id: Option<Value>, method: McpMeth
 }
 
 /// 工具可见性:read-only 仅 Low,否则 Low + Medium(High 永不可见)
-fn visible(read_only: bool, risk: RiskLevel) -> bool {
+pub(crate) fn visible(read_only: bool, risk: RiskLevel) -> bool {
     if read_only {
         risk == RiskLevel::Low
     } else {
@@ -287,6 +289,22 @@ mod tests {
         assert_eq!(v["error"]["code"], crate::protocol::METHOD_NOT_FOUND);
     }
 
+    #[tokio::test]
+    async fn tools_call_missing_name_returns_clear_error() {
+        // tools/call 缺 name 参数:不应回「未知工具: 」(空名),应回明确 METHOD_NOT_FOUND
+        let input =
+            r#"{"jsonrpc":"2.0","id":41,"method":"tools/call","params":{"arguments":{}}}"#;
+        let out = run_io_lines(&[input], false).await;
+        let v: Value = serde_json::from_str(&out[0]).unwrap();
+        assert_eq!(v["error"]["code"], crate::protocol::METHOD_NOT_FOUND);
+        let msg = v["error"]["message"].as_str().unwrap();
+        assert!(
+            msg.contains("name"),
+            "空 name 应给出明确提示,实际: {msg}"
+        );
+        assert!(!msg.contains("未知工具: "), "不应是空名「未知工具: 」: {msg}");
+    }
+
     #[tokio::test]
     async fn tools_call_high_risk_is_rejected() {
         let input =