ux: token Proxmox en deux champs séparés (ID + Secret)

Install.vue et Settings.vue : remplace le champ unique "PVEAPIToken=..."
par deux inputs distincts — Token ID (ex: enzo@pam!panel) et Secret
(uuid). L'assemblage PVEAPIToken=ID=Secret se fait côté frontend avant
envoi. Plus besoin de connaître le format interne.

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

frontend/src/locales/en.json

@@ -33,8 +33,9 @@
     "sshSuccess": "SSH connection successful!",
     "sshFailed": "SSH connection failed",
     "proxmoxUrl": "Proxmox URL",
-    "proxmoxToken": "Proxmox API token",
-    "proxmoxTokenHint": "Format: PVEAPIToken=user{'@'}realm!tokenid=secret",
+    "proxmoxTokenId": "Token ID",
+    "proxmoxTokenSecret": "Token secret",
+    "proxmoxTokenHint": "Token ID: enzo{'@'}pam!panel — Secret: UUID generated by Proxmox",
     "back": "Back",
     "next": "Next",
     "finish": "Complete installation",
@@ -115,7 +116,9 @@
     "sshUsername": "SSH username",
     "sshPassword": "SSH password",
     "proxmoxUrl": "Proxmox URL",
-    "proxmoxToken": "Proxmox API token",
+    "proxmoxTokenId": "Proxmox Token ID",
+    "proxmoxTokenIdPlaceholder": "enzo@pam!panel",
+    "proxmoxTokenSecret": "Token secret",
     "secretPlaceholder": "Leave empty to keep current value",
     "darkMode": "Dark mode",
     "sidebarPosition": "Sidebar position",