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/routing/routers_test.cpp

@@ -0,0 +1,14 @@
+// Route: /routing/routers/nested/deep  (nested router include)
+#include "support/Assert.hpp"
+
+using namespace molo::example::test;
+
+int main() {
+  Fixture f;
+  auto res = f.client->get("/routing/routers/nested/deep");
+  check(res.status == 200, "status 200");
+  check(contains(res.body, "\"nested\":true"), "nested router reached");
+  auto shallow = f.client->get("/routing/routers");
+  check(shallow.status == 404, "prefix alone is 404");
+  return finish("routing/routers");
+}