fix: prefer IPv4 for Osaka Reality handshake

servers/bwh-jp-osaka/sing-box/etc/sing-box/config.json.template

@@ -13,6 +13,14 @@
       }
     }
   ],
+  "dns": {
+    "servers": [
+      {
+        "type": "local",
+        "tag": "local"
+      }
+    ]
+  },
   "inbounds": [
     {
       "type": "trojan",
@@ -94,7 +102,11 @@
           "enabled": true,
           "handshake": {
             "server": "${REALITY_SERVER_NAME}",
-            "server_port": 443
+            "server_port": 443,
+            "domain_resolver": {
+              "server": "local",
+              "strategy": "prefer_ipv4"
+            }
           },
           "private_key": "${REALITY_PRIVATE_KEY}",
           "short_id": [