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/auth/me_test.cpp

@@ -0,0 +1,21 @@
+// Route: GET /auth/me  (Basic auth)
+#include "support/Assert.hpp"
+
+using namespace molo::example::test;
+using molo::example::fw::Method;
+
+int main() {
+  Fixture f;
+  auto anon = f.client->get("/auth/me");
+  check(anon.status == 401, "no header is 401");
+  auto bad = f.client->request(
+      Method::Get, "/auth/me", "",
+      {{"Authorization", "Basic YWRhOndyb25n"}});
+  check(bad.status == 403, "bad password is 403");
+  auto ok = f.client->request(
+      Method::Get, "/auth/me", "",
+      {{"Authorization", "Basic YWRhOmNvcnJlY3QtaG9yc2U="}});
+  check(ok.status == 200, "good credentials are 200");
+  check(contains(ok.body, "\"user\":\"ada\""), "identity returned");
+  return finish("auth/me");
+}