fix: improve IP classification and source fallback

.github/workflows/release.yml

@@ -7,9 +7,9 @@ on:
   workflow_dispatch:
     inputs:
       release_tag:
-        description: Existing formal tag to publish, for example v2.1.1
+        description: Existing formal tag to publish, for example v2.1.2
         required: true
-        default: v2.1.1
+        default: v2.1.2
         type: string
 
 concurrency:

.github/workflows/update-vpngate-mirror.yml

@@ -2,7 +2,8 @@ name: Update VPNGate mirror
 
 on:
   schedule:
-    - cron: "*/15 * * * *"
+    # Offset from quarter-hour peaks because GitHub may delay busy schedules.
+    - cron: "7,22,37,52 * * * *"
   workflow_dispatch:
   push:
     branches: [main]