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/uploads/file_test.cpp

@@ -0,0 +1,23 @@
+// Route: POST /uploads/file
+#include "support/Assert.hpp"
+
+using namespace molo::example::test;
+using molo::example::fw::Method;
+
+int main() {
+  Fixture f;
+  auto ok = f.client->post("/uploads/file?filename=note.txt", "hello",
+                           "text/plain");
+  check(ok.status == 201, "allowed upload is 201");
+  check(contains(ok.body, "\"size\":5"), "size reported");
+  auto evil = f.client->request(Method::Post,
+                                "/uploads/file?filename=x.bin", "data",
+                                {{"Content-Type", "application/x-evil"}});
+  check(evil.status == 415, "blocked content type is 415");
+  auto traversal = f.client->post("/uploads/file?filename=../x.txt", "d",
+                                  "text/plain");
+  check(traversal.status == 400, "unsafe filename is 400");
+  check(f.services.uploads->list().size() == 1,
+        "side effect: one upload stored");
+  return finish("uploads/file");
+}