[grade=B] DC-105: Smart defaults wizard — 'What do you want to self-host?'

3 endpoints:
- GET  /api/v1/wizard/categories — list 6 categories with icons
- POST /api/v1/wizard/recommend — get prioritized service list from selected categories
- POST /api/v1/wizard/apply — generate deployment plan

Categories: media-streaming, file-sync, home-network, smart-home, development, monitoring.
Hardware profiles: minimal (3 svcs), medium (6), powerful (12).
Cross-category dedup with priority sorting. 1633 tests pass.

dashcaddy-api/src/app.js

@@ -64,6 +64,7 @@ const i18nRoutes = require('../routes/i18n');
 const discoverRoutes = require('../routes/discover');
 const discoverAdoptRoutes = require('../routes/discover-adopt');
 const catalogRoutes = require('../routes/catalog');
+const wizardRoutes = require('../routes/wizard');
 const configRoutes = require('../routes/config');
 const dnsRoutes = require('../routes/dns');
 const notificationRoutes = require('../routes/notifications');
@@ -625,6 +626,12 @@ async function createApp() {
     APP_TEMPLATES: require('./docker/app-templates'),
     asyncHandler: ctx.asyncHandler,
   }));
+
+  // DC-105: Smart defaults wizard
+  apiRouter.use(wizardRoutes({
+    APP_TEMPLATES: require('./docker/app-templates'),
+    asyncHandler: ctx.asyncHandler,
+  }));
   apiRouter.use(updatesRoutes({
     updateManager: ctx.updateManager,
     selfUpdater: ctx.selfUpdater,