fix(virgool): enable virgool.io via POST user-existence API

Use existing POST support from main to enable virgool.io:
- checkType: message with presenseStrs for user_exist:true
- urlProbe: POST /api/v1.4/auth/user-existence
- requestMethod: POST with requestPayload for username lookup
- Content-Type: application/json header
- absenceStrs with Persian user not found message
- disabled flag removed — POST API bypasses JS cookie protection

maigret/resources/data.json

@@ -13645,18 +13645,31 @@
             "usernameUnclaimed": "noonewouldeverusethis7"
         },
         "Virgool": {
-            "disabled": true,
             "tags": [
                 "blog",
                 "ir"
             ],
-            "checkType": "status_code",
-            "absenceStrs": [
-                "\u06f4\u06f0\u06f4"
+            "checkType": "message",
+            "presenseStrs": [
+                "\"user_exist\":true",
+                "\"user_exist\": true"
             ],
+            "absenceStrs": [
+                "\u06a9\u0627\u0631\u0628\u0631\u06cc \u0628\u0627 \u0627\u06cc\u0646 \u0645\u0634\u062e\u0635\u0627\u062a \u06cc\u0627\u0641\u062a \u0646\u0634\u062f"
+            ],
+            "headers": {
+                "Content-Type": "application/json"
+            },
             "alexaRank": 31518,
             "urlMain": "https://virgool.io/",
             "url": "https://virgool.io/@{username}",
+            "urlProbe": "https://virgool.io/api/v1.4/auth/user-existence",
+            "requestMethod": "POST",
+            "requestPayload": {
+                "username": "{username}",
+                "type": "login",
+                "method": "username"
+            },
             "usernameClaimed": "blue",
             "usernameUnclaimed": "noonewouldeverusethis7"
         },