feat: Completes hvac-system-performance views and api call.

Sources/ViewController/Live.swift

@@ -82,8 +82,9 @@ extension ViewController: DependencyKey {
         switch route {
         case .index:
           return request.respond(HVACSystemPerformanceForm())
-        case .submit:
-          return HVACSystemPerformanceResult()
+        case let .submit(hvacRequest):
+          let response = try await hvacRequest.respond(logger: request.logger)
+          return HVACSystemPerformanceResult(response: response)
         }
 
       case let .moldRisk(route):