P7 wizard prod wiring fix [grade=B] (PR #2)

Judge B r1 urn:ump:2swys44kxvulm5flu4skibjq3yfvtnzrsbgkvm2g65ht55i4jtoa. Dogfood finding: wizard mount omitted providers. 3413/3413.

dashcaddy-api/src/app.js

@@ -776,8 +776,14 @@ async function createApp() {
     asyncHandler: ctx.asyncHandler,
     log: ctx.log,
   }));
+  // Private Network wizard (DC-152). Dogfood finding 2026-10-04: the wizard
+  // factory needs INSTANCES keyed by mode id; without them every mode
+  // selection 503s provider_unavailable (unit tests inject their own map).
+  const p7TailscaleProvider = require('./network/providers/tailscale').createTailscaleProvider(); // eslint-disable-line global-require
+  const p7WireGuardProvider = require('./network/providers/wireguard').createWireGuardProvider(); // eslint-disable-line global-require
   apiRouter.use('/network/wizard', networkWizardRoutes({
     registry: { getActiveProvider },
+    providers: { tailscale: p7TailscaleProvider, wireguard: p7WireGuardProvider },
     peopleStore: p7PeopleStore,
     accessStore: p7AccessStore,
     asyncHandler: ctx.asyncHandler,