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/ws/chat_test.cpp

@@ -0,0 +1,15 @@
+// Route: /ws/chat  (websocket skeleton endpoint)
+#include "support/Assert.hpp"
+
+using namespace molo::example::test;
+
+int main() {
+  Fixture f;
+  auto info = f.client->get("/ws/chat");
+  check(info.status == 200, "status 200");
+  check(contains(info.body, "\"protocol\":\"websocket\""),
+        "upgrade contract described");
+  auto echo = f.client->post("/ws/chat", "ping", "text/plain");
+  check(contains(echo.body, "\"echo\":\"ping\""), "frame echoed");
+  return finish("ws/chat");
+}