feat(10-02): add tender-radar module-loader whitelist entry + placeholder page

- MODULE_REGISTRY['tender-radar'] entry (mirrors cert-manager/dkv-fleet shape)
- minimal client-component placeholder page proving activation -> page-load path
- hardcoded German string is an intentional MVP stub; full i18n is CONFIG-03 (Phase 14)

apps/web/src/app/(portal)/modules/tender-radar/page.tsx

@@ -0,0 +1,31 @@
+'use client';
+
+/**
+ * Ausschreibungs-Radar module page within the portal.
+ *
+ * MVP stub (Plan 10-02, CONFIG-01): proves the activation -> page-load
+ * path (marketplace seed -> module-loader whitelist -> lazy-loaded
+ * page). Real results UI (search, filters, tender list) lands in
+ * Phase 11.
+ *
+ * Intentional hardcoded German string: full i18n (next-intl message
+ * keys) is CONFIG-03, planned for Phase 14. Do not add a translation
+ * key for this stub yet — replace this whole component in Phase 11.
+ */
+export default function TenderRadarPage() {
+  return (
+    <div className="mx-auto max-w-2xl space-y-6 p-6">
+      <div>
+        <h1 className="text-2xl font-bold tracking-tight">
+          Ausschreibungs-Radar
+        </h1>
+      </div>
+
+      <div className="rounded-lg border border-border bg-card p-6 shadow-sm">
+        <p className="text-sm text-muted-foreground">
+          Ausschreibungen werden erfasst.
+        </p>
+      </div>
+    </div>
+  );
+}

apps/web/src/lib/module-loader.ts

@@ -47,6 +47,12 @@ export const MODULE_REGISTRY: Record<string, ModuleRegistryEntry> = {
       { ssr: false },
     ),
   },
+  'tender-radar': {
+    component: dynamic(
+      () => import('@/app/(portal)/modules/tender-radar/page'),
+      { ssr: false },
+    ),
+  },
 };
 
 /**