fix(crowdsec-dashboard): Add get_overview to ACL permissions

The new get_overview RPC method was missing from the ACL file,
causing "Access denied" errors in the frontend.

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

package/secubox/luci-app-crowdsec-dashboard/root/usr/share/rpcd/acl.d/luci-app-crowdsec-dashboard.json

@@ -4,6 +4,7 @@
 		"read": {
 			"ubus": {
 				"luci.crowdsec-dashboard": [
+					"get_overview",
 					"decisions",
 					"alerts",
 					"metrics",