feat(admin): super-admin user detail dashboard

Add a read-only User Detail dashboard for super admins, reachable by
clicking a user name in the admin users list.

Backend: new `admin` module aggregating existing domain services
(no new entities). ADMIN-only endpoints under /api/v1/admin:
overview (profile, account status, wallet balance, revenue, summary
counts), wallet transactions, applications (incl. deleted/docked with
restore eligibility), build/deploy errors, tickets with conversation,
and a composite activity timeline. Adds BillingService.getRevenueSummary
and guards against a wallet get-or-create race in the overview reads.

Frontend: tabbed detail page (overview/applications/activity/errors/
tickets) with lazy per-tab queries; user names in the admin list link to
it (admin only); fa/en i18n keys and response types.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/i18n/dictionaries/en.ts

@@ -794,6 +794,82 @@ const en: Dictionary = {
       roleUpdated: 'Role updated',
       passwordUpdated: 'Password updated',
       passwordFailed: 'Failed to update password',
+      detail: {
+        back: 'Back',
+        notFound: 'User not found',
+        loading: 'Loading…',
+        viewDetails: 'View details',
+        tabOverview: 'Overview',
+        tabApplications: 'Applications',
+        tabActivity: 'Activity',
+        tabErrors: 'Errors',
+        tabTickets: 'Tickets',
+        accountStatus: 'Account status',
+        basicInfo: 'Basic info',
+        walletBalance: 'Wallet balance',
+        revenue: 'Revenue generated',
+        totalCharged: 'Total charged',
+        totalRefunded: 'Total refunded',
+        joinedAt: 'Joined',
+        namespace: 'Namespace',
+        recentTransactions: 'Recent transactions',
+        noTransactions: 'No transactions yet.',
+        countsTitle: 'Summary',
+        appsTotal: 'Total applications',
+        appsActive: 'Active apps',
+        appsDeleted: 'Deleted / archived apps',
+        managedServices: 'Managed services',
+        optionalServices: 'Add-on services',
+        deploymentsCount: 'Deployments',
+        ticketsOpenCount: 'Open tickets',
+        txType: 'Type',
+        txAmount: 'Amount',
+        txBalance: 'Balance after',
+        txDesc: 'Description',
+        txDate: 'Date',
+        txTypes: { charge: 'Charge', deduction: 'Deduction', refund: 'Refund', gateway_payment: 'Gateway payment' },
+        appName: 'Name',
+        appType: 'Type',
+        appStatus: 'Status',
+        appExpires: 'Service expiry',
+        appCreated: 'Created',
+        appResources: 'Resources',
+        activeApps: 'Active apps',
+        deletedApps: 'Deleted / archived apps',
+        noApps: 'No applications.',
+        expired: 'Expired',
+        remainingDays: '{n} days left',
+        remainingHours: '{n} hours left',
+        lifecycle: { active: 'Active', suspended: 'Suspended', pending_deletion: 'Pending deletion', docked: 'Archived', deleted: 'Deleted' },
+        restore: { restorable: 'Restorable', recoverable: 'Recoverable with payment', none: 'Not restorable' },
+        errorApp: 'Application',
+        errorReason: 'Error reason',
+        errorTime: 'Time',
+        errorState: 'State',
+        errorResolved: 'Resolved',
+        errorOpen: 'Open',
+        noErrors: 'No build/deploy errors.',
+        noErrorMessage: 'No error message recorded.',
+        viewLogs: 'View logs',
+        hideLogs: 'Hide logs',
+        buildLog: 'Build log',
+        deployLog: 'Deploy log',
+        noLog: 'No log available.',
+        noActivity: 'No activity recorded.',
+        activityTypes: { app_created: 'Application created', app_docked: 'Application archived', app_deleted: 'Application deleted', deployment: 'Deployment', transaction: 'Wallet transaction', ticket: 'Support ticket' },
+        ticketSubject: 'Subject',
+        ticketStatus: 'Status',
+        ticketDept: 'Department',
+        ticketPriority: 'Priority',
+        ticketMessages: '{n} messages',
+        noTickets: 'No tickets.',
+        viewConversation: 'View conversation',
+        hideConversation: 'Hide conversation',
+        ticketStatuses: { open: 'Open', answered: 'Answered', waiting: 'Waiting', closed: 'Closed' },
+        ticketDepts: { technical: 'Technical', sales: 'Sales' },
+        ticketPriorities: { low: 'Low', medium: 'Medium', high: 'High' },
+        senderRoles: { user: 'User', admin: 'Admin', technical: 'Technical support', sales: 'Sales' },
+      },
     },
     pools: {
       title: 'Cluster Pools',