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/telemetry/trace_test.cpp

@@ -0,0 +1,16 @@
+// Route: GET /telemetry/trace  (span plus correlation id)
+#include "support/Assert.hpp"
+
+using namespace molo::example::test;
+
+int main() {
+  Fixture f;
+  auto res = f.client->get("/telemetry/trace");
+  check(res.status == 200, "status 200");
+  check(contains(res.body, "\"trace\":\"trace-"), "trace id issued");
+  check(contains(res.body, "\"correlation\":\"req-"),
+        "correlation id flows");
+  check(f.services.telemetry->spans().size() == 1,
+        "side effect: span recorded");
+  return finish("telemetry/trace");
+}