feat: add 3x-ui Xray rule synchronizer

config.example.yaml

@@ -0,0 +1,22 @@
+servers:
+  - name: eu-1
+    url: https://eu-1.example.com
+    # Choose one authentication method:
+    # token: paste-the-3x-ui-API-token-here
+    tokenEnv: THREE_X_UI_EU_1_TOKEN
+
+rules:
+  - name: google
+    # disabled: true # writes enabled: false in the Xray rule
+    match:
+      domain: [geosite:google]
+      inboundTag: [vless-in]
+    outbound:
+      tagRegex: "^proxy-google-"
+      strategy: leastPing
+
+sync:
+  # Omit interval for a one-off run, or pass -once to override it.
+  interval: 5m
+  # Managed rules go after manually maintained rules by default.
+  position: last