feat: add test_connection command to all integrations for the instance Test button

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

integrations/virustotal/manifest.yaml

@@ -1,8 +1,8 @@
 id: virustotal
 name: VirusTotal
-version: 1.0.0
+version: 1.0.1
 description: VirusTotal API v3 — reputation lookups for IPs and domains.
-changelog: "1.0.0 — Initial release: IP and domain reputation lookups."
+changelog: "1.0.1 — Added test_connection for the instance Test button. 1.0.0 — Initial release: IP and domain reputation lookups."
 category: enrichment
 
 config_schema:
@@ -60,3 +60,17 @@ commands:
       method: GET
       path: /domains/{domain}
       auth_ref: apikey
+
+  - id: test_connection
+    name: virustotal-test-connection
+    description: "Verify connectivity and credentials (used by the Test button)."
+    risk: read
+    inputs_schema:
+      properties: {}
+      required: []
+    outputs_schema:
+      properties: {}
+    request:
+      method: GET
+      path: /ip_addresses/8.8.8.8
+      auth_ref: apikey