feat(profile): add counterparty card with dadata search and cart gating

server/api/dadata/party.post.ts

@@ -0,0 +1,53 @@
+type DadataPartySuggestion = {
+  value: string;
+  unrestricted_value?: string;
+  data?: {
+    inn?: string;
+    kpp?: string;
+    ogrn?: string;
+    address?: {
+      value?: string;
+    };
+    management?: {
+      name?: string;
+      post?: string;
+    };
+  };
+};
+
+export default defineEventHandler(async (event) => {
+  const config = useRuntimeConfig(event);
+  const token = String(config.dadataApiToken || '').trim();
+  if (!token) {
+    throw createError({
+      statusCode: 500,
+      statusMessage: 'DADATA_API_TOKEN is not configured.',
+    });
+  }
+
+  const body = await readBody<{ query?: string }>(event);
+  const query = String(body?.query ?? '').trim();
+  if (query.length < 2) {
+    return { suggestions: [] as DadataPartySuggestion[] };
+  }
+
+  const response = await $fetch<{ suggestions?: DadataPartySuggestion[] }>(
+    'https://suggestions.dadata.ru/suggestions/api/4_1/rs/suggest/party',
+    {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        Accept: 'application/json',
+        Authorization: `Token ${token}`,
+      },
+      body: {
+        query,
+        count: 10,
+      },
+    },
+  );
+
+  return {
+    suggestions: response.suggestions ?? [],
+  };
+});