chore: init frontend+backend skeleton

backend/src/health_controller.cc

@@ -0,0 +1,18 @@
+#include "csp/health_controller.h"
+
+#include "csp/version.h"
+
+namespace csp {
+
+void HealthController::health(
+    const drogon::HttpRequestPtr& /*req*/,
+    std::function<void(const drogon::HttpResponsePtr&)>&& callback) {
+  auto json = Json::Value{};
+  json["ok"] = true;
+  json["version"] = kVersion;
+  auto resp = drogon::HttpResponse::newHttpJsonResponse(json);
+  resp->setStatusCode(drogon::k200OK);
+  callback(resp);
+}
+
+}  // namespace csp

backend/src/main.cc

@@ -0,0 +1,15 @@
+#include <drogon/drogon.h>
+
+int main(int argc, char** argv) {
+  (void)argc;
+  (void)argv;
+
+  // Basic defaults. Will be moved to config-driven later.
+  drogon::app()
+      .addListener("0.0.0.0", 8080)
+      .setThreadNum(4);
+
+  LOG_INFO << "csp_server starting at http://0.0.0.0:8080";
+  drogon::app().run();
+  return 0;
+}

backend/src/version.cc

@@ -0,0 +1,5 @@
+#include "csp/version.h"
+
+namespace csp {
+// Keep translation unit for future expansion.
+}  // namespace csp