Add sector classification module, integrate into all 7 scrapers, fix CF pagination

test-api.js

@@ -0,0 +1,18 @@
+import axios from 'axios';
+
+async function testAPI() {
+  try {
+    console.log('Testing opportunities API...');
+    const response = await axios.get('https://api.digitalmarketplace.service.gov.uk/v0.1/opportunities', {
+      params: { status: 'open', page: 1, per_page: 5 },
+      timeout: 5000,
+      validateStatus: () => true
+    });
+    console.log('Status:', response.status);
+    console.log('Response:', JSON.stringify(response.data).substring(0, 500));
+  } catch (e) {
+    console.error('Error:', e.message);
+  }
+}
+
+testAPI();