chore: import upstream snapshot with attribution

tools/server/server-tools.h

@@ -0,0 +1,41 @@
+#pragma once
+
+#include "server-common.h"
+#include "server-http.h"
+#include "server-queue.h"
+
+#include <atomic>
+#include <functional>
+
+struct server_tool {
+    std::string name;
+    std::string display_name;
+    bool permission_write = false;
+    bool support_stream = false; // if true, output can be streamed
+
+    virtual ~server_tool() = default;
+    virtual json get_definition() const = 0;
+
+    struct stream {
+        server_response & qr;
+        int id;
+        std::function<bool()> alive;
+        void push(const std::string & chunk);
+    };
+    virtual json invoke(json params, stream * st = nullptr) const = 0;
+
+    json to_json() const;
+};
+
+struct server_tools {
+    std::vector<std::unique_ptr<server_tool>> tools;
+
+    // for streaming
+    server_response queue_res;
+    std::atomic<int> res_id{0};
+
+    void setup(const std::vector<std::string> & enabled_tools);
+
+    server_http_context::handler_t handle_get;
+    server_http_context::handler_t handle_post;
+};