restrict consent-banner text length

Add a maxLength in of 64*1024 in the frontend and the api. We allow
a max body size of 512*1024 in the api (with patch [0]) so we should be
fine.

[0]: https://git.proxmox.com/?p=proxmox.git;a=commit;h=cf9e6c03a092acf8808ce83dad9249414fe4d588

Signed-off-by: Gabriel Goller <g.goller@proxmox.com>
Link: https://lore.proxmox.com/20250410082052.53097-1-g.goller@proxmox.com

src/config/node.rs

@@ -174,6 +174,11 @@ pub enum Translation {
         "description" : {
             optional: true,
             schema: MULTI_LINE_COMMENT_SCHEMA,
+        },
+        "consent-text" : {
+            optional: true,
+            type: String,
+            max_length: 64 * 1024,
         }
     },
 )]

www/config/NodeOptionView.js

@@ -59,6 +59,9 @@ Ext.define('PBS.NodeOptionView', {
 	    name: 'consent-text',
 	    text: gettext('Consent Text'),
 	    deleteEmpty: true,
+	    fieldOpts: {
+		maxLength: 64 * 1024,
+	    },
 	    onlineHelp: 'consent_banner',
 	},
     ],