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/cache/lookup_test.cpp

@@ -0,0 +1,14 @@
+// Route: /cache/lookup  (miss then hit)
+#include "support/Assert.hpp"
+
+using namespace molo::example::test;
+
+int main() {
+  Fixture f;
+  auto miss = f.client->get("/cache/lookup?key=k1");
+  check(contains(miss.body, "\"hit\":false"), "first lookup misses");
+  auto hit = f.client->get("/cache/lookup?key=k1");
+  check(contains(hit.body, "\"hit\":true"), "second lookup hits");
+  check(contains(hit.body, "computed-for-k1"), "same value served");
+  return finish("cache/lookup");
+}