feat(smtp): implement built-in SMTP server for mail ingestion

- Add lightweight SMTP server support using `lettre` and `tokio`.
- Implement `DATA_SMTP_INGEST` permission check for inbound mail.
- Support real-time email archiving via SMTP protocol.
- Integrate with existing EML index manager for automated indexing.

web/src/features/settings/profile/permissions-dialog.tsx

@@ -80,6 +80,7 @@ function getAccountCategories(t: (key: string) => string) {
         'data:delete',
         'data:export:batch',
         'data:import:batch',
+        'data:smtp:ingest',
       ],
     },
   ]

web/src/features/users/roles/components/action-dialog.tsx

@@ -86,6 +86,7 @@ const CATEGORY_MAP: Record<'Global' | 'Account', { titleKey: string; keys: strin
         'data:delete',
         'data:export:batch',
         'data:import:batch',
+        'data:smtp:ingest',
       ],
     },
   ],

web/src/features/users/roles/components/permissions-dialog.tsx

@@ -58,7 +58,7 @@ export function PermissionsDialog({ currentRow, open, onOpenChange }: Props) {
     account: [
       {
         titleKey: "roles.categories.account_resource",
-        keys: ["account:manage", "account:read_details", "data:read", "data:manage", "data:raw:download", "data:delete", "data:export:batch", "data:import:batch"]
+        keys: ["account:manage", "account:read_details", "data:read", "data:manage", "data:raw:download", "data:delete", "data:export:batch", "data:import:batch", "data:smtp:ingest"]
       }
     ]
   };