feat: implement MoloApp plans 01-15 with integration

Full C++23 framework tree: runtime, observability, security,
data, app, realtime, supervisor, clients, CLI, example plus
enterprise tenancy, audit, operability, governance,
supplychain. Postgres via docker compose for tests.

tests/example/socketio/rooms_test.cpp

@@ -0,0 +1,17 @@
+// Route: /socketio/rooms  (socket.io skeleton endpoint)
+#include "support/Assert.hpp"
+
+using namespace molo::example::test;
+
+int main() {
+  Fixture f;
+  auto info = f.client->get("/socketio/rooms");
+  check(info.status == 200, "status 200");
+  check(contains(info.body, "socket.io"), "protocol named");
+  check(contains(info.body, "long-polling"), "fallback named");
+  auto emit = f.client->post(
+      "/socketio/rooms", "{\"room\":\"lobby\",\"event\":\"join\"}",
+      "application/json");
+  check(contains(emit.body, "\"ack\":true"), "emit acknowledged");
+  return finish("socketio/rooms");
+}