feat(api): register docs route in server and test helper

apps/api/src/index.ts

@@ -12,6 +12,7 @@ import { registerUpload } from "./plugins/upload.js";
 import { apiKeyRoutes } from "./routes/api-keys.js";
 import { registerBatchRoutes } from "./routes/batch.js";
 import { brandingRoutes } from "./routes/branding.js";
+import { docsRoutes } from "./routes/docs.js";
 import { fileRoutes } from "./routes/files.js";
 import { registerPipelineRoutes } from "./routes/pipeline.js";
 import { registerProgressRoutes } from "./routes/progress.js";
@@ -99,6 +100,9 @@ await brandingRoutes(app);
 // Teams routes
 await teamsRoutes(app);
 
+// API docs (Scalar)
+await docsRoutes(app);
+
 // Health check
 app.get("/api/v1/health", async () => {
   let dbOk = false;