Use WithReference for chatapi, update proxy config, and add WithExplicitStart to YARP

Co-authored-by: davidfowl <[email protected]>

Author: Copilot

AIChat.AppHost/Program.cs

@@ -48,8 +48,7 @@
                      .WaitFor(cache);
 
 var frontend = builder.AddViteApp("chatui-fe", "../chatui")
-                      .WithEnvironment("BACKEND_URL", chatapi.GetEndpoint("http"))
-                      .WithOtlpExporter()
+                      .WithReference(chatapi)
                       .WithEnvironment("BROWSER", "none");
 
 // We use YARP as the static file server and reverse proxy.
@@ -58,8 +57,9 @@
        .PublishWithStaticFiles(frontend)
        .WithConfiguration(c =>
        {
-           c.AddRoute("/api/{**catch-all}", chatapi.GetEndpoint("http"));
-       });
+           c.AddRoute("/api/{**catch-all}", chatapi);
+       })
+       .WithExplicitStart();
 
 builder.Build().Run();
 

chatui/vite.config.ts

@@ -11,11 +11,11 @@ export default defineConfig({
     port,
     proxy: {
       '/api': {
-        target: process.env.BACKEND_URL,
+        target: process.env.CHATAPI_HTTPS || process.env.CHATAPI_HTTP,
         changeOrigin: true,
       },
       '/api/chat/stream': {
-        target: process.env.BACKEND_URL,
+        target: process.env.CHATAPI_HTTPS || process.env.CHATAPI_HTTP,
         ws: true,
         changeOrigin: true,
       }