fix: Magisk module incorrectly matches the lookup main rule in Android 15 (#2259)

Fix the issue where the Magisk module incorrectly matches the lookup main rule in Android 15's cellular network rules, causing data plane connectivity failure

easytier-contrib/easytier-magisk/easytier_core.sh

@@ -99,7 +99,7 @@ while true; do
     # 启动后的扫尾工作
     if pgrep -f "${EASYTIER}" >/dev/null; then
         
-        if ! ip rule show | grep -q "lookup main"; then
+        if ! ip rule show | grep -qE '^[0-9]+:[[:space:]]+from all lookup main$'; then
             ip rule add from all lookup main
         fi
         
@@ -109,4 +109,4 @@ while true; do
     fi
     
     sleep 10s
-done
+done