Add support for message history pagination, preserve scroll in rendering, and improve draft/message workflows.

src/app.js

@@ -19,7 +19,7 @@ import {createChatsRouter} from "./routes/chats.js";
 import {createPagesRouter} from "./routes/pages.js";
 import {createPersonasRouter} from "./routes/personas.js";
 import {createSettingsRouter} from "./routes/settings.js";
-import {createSystemRouter} from "./routes/system.js";
+import {createHealthRouter, createSystemRouter} from "./routes/system.js";
 import {createAttachmentService} from "./services/attachmentService.js";
 import {createUploadsRouter} from "./routes/uploads.js";
 import {createVisionDebugService} from "./services/visionDebugService.js";
@@ -271,6 +271,7 @@ export function createApp(options = {}) {
     );
 
     app.use(observability.middleware);
+    app.use(createHealthRouter({modelService}));
     app.use(express.json({limit: "1mb"}));
     app.use(session({
         store: options.sessionStore || (config.testMode ? undefined : new FileStore({path: config.sessionsDir, reapInterval: 3600})),