docs: promote /web from develop for backup-restore, Log2RAM and Network Flow guides

Brings 69 files from develop under /web/:
- Full Backup & Restore section (11 pages EN + ES: overview, how-it-works, destinations,
  creating backups, scheduled jobs, restoring, cross-kernel hydration)
- Log2RAM dedicated block in post-install/optional with commands + upstream link
- Network Flow diagram documented on monitor/dashboard/network
- Rewritten category descriptions in post-install/customizable
- Fixed automated.json thresholds + link to Log2RAM section
- Updated screenshots (network-flow-overview, storage-top-row, vms modals)

No code, config or AppImage binaries touched — /web/ scope only. Merging deploys
the documentation site to the current beta release notes.

web/messages/es/common.json

@@ -168,7 +168,19 @@
       "aboutContributors": "Contribuidores",
       "aboutContributing": "Contribuir",
       "aboutCodeOfConduct": "Código de conducta",
-      "externalRepositories": "Repositorios externos"
+      "externalRepositories": "Repositorios externos",
+      "backupRestore": "Backup & Restore",
+      "backupRestoreOverview": "Descripción general",
+      "backupRestoreHowItWorks": "Cómo funciona",
+      "backupRestoreDestinations": "Destinos",
+      "backupRestoreDestOverview": "Descripción general",
+      "backupRestoreDestLocal": "Archivo local",
+      "backupRestoreDestPbs": "Proxmox Backup Server",
+      "backupRestoreDestBorg": "Borg",
+      "backupRestoreCreating": "Crear copias",
+      "backupRestoreJobs": "Trabajos programados",
+      "backupRestoreRestoring": "Restauración",
+      "backupRestoreCrossKernel": "Restauración cross-kernel"
     }
   },
   "hero": {
@@ -213,4 +225,4 @@
       "ogTail": "Suscríbete vía RSS o vuelve a comprobarlo para nuevas versiones."
     }
   }
-}
+}