fix: Fix UCI rule deletion to handle index shifting in WAN access

When deleting multiple UCI firewall rules by index, the indices shift
after each deletion. The previous method using section names didn't
work reliably with fw4's anonymous rules.

New approach uses a while loop that:
- Iterates through rules by index
- Deletes matching rule and restarts from beginning
- Continues until no matching rules found

This ensures all secubox_wan_* rules are properly removed before
reapplying new ones.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package/secubox/secubox-core/root/usr/sbin/secubox-wan-access

@@ -12,16 +12,24 @@ RULE_PREFIX="secubox_wan"
 # Remove all SecuBox WAN access rules from UCI
 remove_uci_rules() {
 	local changed=0
-	local sections=""
 
-	# Find all secubox_wan rules by name
-	sections=$(uci show firewall 2>/dev/null | grep "\.name='${RULE_PREFIX}" | cut -d. -f2 | cut -d= -f1)
+	# Keep removing rules until none left (indices shift after each delete)
+	while true; do
+		local found=0
+		local i=0
+		while true; do
+			local name=$(uci -q get firewall.@rule[$i].name 2>/dev/null)
+			[ -z "$name" ] && break
 
-	for section in $sections; do
-		[ -n "$section" ] && {
-			uci delete "firewall.$section" 2>/dev/null
-			changed=1
-		}
+			if echo "$name" | grep -q "^${RULE_PREFIX}"; then
+				uci delete "firewall.@rule[$i]" 2>/dev/null
+				changed=1
+				found=1
+				break  # Restart from beginning since indices shifted
+			fi
+			i=$((i + 1))
+		done
+		[ "$found" -eq 0 ] && break
 	done
 
 	[ "$changed" -eq 1 ] && uci commit firewall