add authenticated API /api/diag/proxy/neighbor/list endpoint

- returns all neighbors (connection initiators) and their stats

src/service/httpd/diag/daig_proxy.hpp

@@ -42,6 +42,7 @@
 #include <ext/lmhpp/include/lmhttpd.hpp>
 #include <service/httpd/util.hpp>
 #include <service/http/jsonize.hpp>
+#include <proxy/nbrhood.hpp>
 
 
 static nlohmann::json json_proxy_session_list(struct MHD_Connection * connection, std::string const& meth, std::string const& req) {
@@ -56,4 +57,15 @@ static nlohmann::json json_proxy_session_list(struct MHD_Connection * connection
 
     return SmithProxy::instance().API.proxy_session_list_json(oid, flag_active_only, flag_tlsinfo, flag_verbose);
 
-}
+}
+
+static nlohmann::json json_proxy_neighbor_list(struct MHD_Connection * connection, std::string const& meth, std::string const& req) {
+
+    auto oid = connection_ull_param(connection, "oid", 0ULL);
+    using namespace jsonize;
+
+    bool flag_verbose = load_json_params<bool>(req, "verbose").value_or(false);
+
+    return NbrHood::instance().to_json();
+
+}

src/service/httpd/handlers/dispatchers.cpp

@@ -82,6 +82,17 @@ namespace sx::webserver::dispatchers {
             handler.Content_Type = "application/json";
             server.addController(&handler);
         }
+
+        for(auto const& meth: {"GET", "POST"}) {
+            static Http_Responder handler(
+                    meth,
+                    "/api/diag/proxy/neighbor/list",
+                    authorized::token_protected<json>(json_proxy_neighbor_list)
+            );
+            handler.Content_Type = "application/json";
+            server.addController(&handler);
+        }
+
     }
 
     void controller_add_uni(lmh::WebServer &server) {