feat(30-01): create onboarding route with Zod validation and register

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/server/index.ts

@@ -19,6 +19,7 @@ import { globalItemRoutes } from "./routes/global-items.ts";
 import { imageRoutes } from "./routes/images.ts";
 import { itemRoutes } from "./routes/items.ts";
 import { oauthRoutes, wellKnownRoute } from "./routes/oauth.ts";
+import { onboardingRoutes } from "./routes/onboarding.ts";
 import { profileRoutes } from "./routes/profiles.ts";
 import { settingsRoutes } from "./routes/settings.ts";
 import { setupRoutes } from "./routes/setups.ts";
@@ -191,6 +192,7 @@ app.route("/api/users", profileRoutes);
 app.route("/api/setups", setupRoutes);
 app.route("/api/discovery", discoveryRoutes);
 app.route("/api/global-items", globalItemRoutes);
+app.route("/api/onboarding", onboardingRoutes);
 app.route("/api/tags", tagRoutes);
 
 // MCP server (conditionally mounted)