fix(backends): Adress-Validierung für Backend-Server + Quick-Backend (v1.1.140)

Pattern-Validator lehnt offensichtlich ungültige Adressen (Sonderzeichen,
Leerzeichen) schon im Frontend ab, bevor sie HAProxy-Config-Generierung
zerstören können. Gilt für Backend-Server-Modal und Domain-Quick-Backend.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

management-ui/src/i18n/locales/de/common.json

@@ -394,6 +394,7 @@
       "edit": "Server bearbeiten",
       "name": "Server-Name",
       "address": "Adresse",
+      "addressInvalid": "Gültige IPv4/IPv6-Adresse oder Hostname eingeben",
       "port": "Port",
       "target": "Endpoint",
       "weight": "Gewicht",

management-ui/src/i18n/locales/en/common.json

@@ -394,6 +394,7 @@
       "edit": "Edit server",
       "name": "Server name",
       "address": "Address",
+      "addressInvalid": "Enter a valid IPv4/IPv6 address or hostname",
       "port": "Port",
       "target": "Endpoint",
       "weight": "Weight",

management-ui/src/pages/Backends/Detail.tsx

@@ -387,7 +387,14 @@ function ServerPanel({ backendID, haproxyStats, isViewer }: { backendID: number;
           <Form.Item label={t('backends.server.name')} name="name" rules={[{ required: true }]}>
             <Input placeholder="vmm-1" />
           </Form.Item>
-          <Form.Item label={t('backends.server.address')} name="address" rules={[{ required: true }]}>
+          <Form.Item
+            label={t('backends.server.address')}
+            name="address"
+            rules={[
+              { required: true },
+              { pattern: /^(\d{1,3}\.){3}\d{1,3}$|^[0-9a-fA-F:]{2,39}$|^[a-zA-Z0-9]([a-zA-Z0-9\-.]{0,61}[a-zA-Z0-9])?$/, message: t('backends.server.addressInvalid') },
+            ]}
+          >
             <Input placeholder="10.0.0.11" />
           </Form.Item>
           <Form.Item label={t('backends.server.port')} name="port" rules={[{ required: true }]}>

management-ui/src/pages/Domains/index.tsx

@@ -413,7 +413,14 @@ export default function DomainsPage() {
               { value: 'https', label: 'https' },
             ]} />
           </Form.Item>
-          <Form.Item label={t('domains.quickBackendAddress')} name="address" rules={[{ required: true }]}>
+          <Form.Item
+            label={t('domains.quickBackendAddress')}
+            name="address"
+            rules={[
+              { required: true },
+              { pattern: /^(\d{1,3}\.){3}\d{1,3}$|^[0-9a-fA-F:]{2,39}$|^[a-zA-Z0-9]([a-zA-Z0-9\-.]{0,61}[a-zA-Z0-9])?$/, message: t('backends.server.addressInvalid') },
+            ]}
+          >
             <Input placeholder="10.0.0.10" />
           </Form.Item>
           <Form.Item label={t('domains.quickBackendPort')} name="port" rules={[{ required: true, type: 'number', min: 1, max: 65535 }]}>