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/replication/state_test.cpp

@@ -0,0 +1,18 @@
+// Route: /replication/state  (append plus since)
+#include "support/Assert.hpp"
+
+using namespace molo::example::test;
+
+int main() {
+  Fixture f;
+  auto add = f.client->post("/replication/state",
+                            "{\"object\":\"doc-1\",\"data\":\"v1\"}",
+                            "application/json");
+  check(add.status == 201, "append is 201");
+  check(contains(add.body, "last-writer-wins"), "conflict rule named");
+  auto full = f.client->get("/replication/state?since=0");
+  check(contains(full.body, "doc-1"), "entry replicated");
+  auto empty = f.client->get("/replication/state?since=99");
+  check(contains(empty.body, "\"entries\":[]"), "cursor filters");
+  return finish("replication/state");
+}