hub v0.1.7: Infrastructure backup endpoints for disaster recovery

Add infra-backup push/pull API for controller DR:
- POST /api/v1/infra-backup — controller pushes infrastructure snapshot
- GET /api/v1/infra-backup/{customer_id} — fresh controller pulls backup
- infra_backups SQLite table with per-customer snapshots
- Customer detail page shows infra backup status card
- README.md with full API docs and DR flow

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

hub/internal/web/server.go

@@ -191,6 +191,9 @@ func (s *Server) handleCustomerDetail(w http.ResponseWriter, r *http.Request, cu
 	notifPrefs, _ := s.store.GetNotificationPrefs(customerID)
 	recentNotifs, _ := s.store.GetRecentNotifications(customerID, 10)
 
+	// Get infra backup metadata
+	infraMeta, _ := s.store.GetInfraBackupMeta(customerID)
+
 	type detailData struct {
 		Customer            *store.CustomerSummary
 		Report              map[string]interface{}
@@ -198,6 +201,8 @@ func (s *Server) handleCustomerDetail(w http.ResponseWriter, r *http.Request, cu
 		OverallStatus       string
 		NotifPrefs          *store.NotificationPrefs
 		RecentNotifications []store.NotificationLogEntry
+		InfraBackup         *store.InfraBackupMeta
+		InfraBackupAge      string
 	}
 
 	overallStatus := "ok"
@@ -211,6 +216,11 @@ func (s *Server) handleCustomerDetail(w http.ResponseWriter, r *http.Request, cu
 		overallStatus = "down"
 	}
 
+	var infraBackupAge string
+	if infraMeta != nil {
+		infraBackupAge = timeAgo(infraMeta.UpdatedAt)
+	}
+
 	data := detailData{
 		Customer:            customer,
 		Report:              report,
@@ -218,6 +228,8 @@ func (s *Server) handleCustomerDetail(w http.ResponseWriter, r *http.Request, cu
 		OverallStatus:       overallStatus,
 		NotifPrefs:          notifPrefs,
 		RecentNotifications: recentNotifs,
+		InfraBackup:         infraMeta,
+		InfraBackupAge:      infraBackupAge,
 	}
 
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")

hub/internal/web/templates/customer.html

@@ -127,6 +127,29 @@
             {{end}}
         </section>
 
+        <!-- Infra Backup (Disaster Recovery) -->
+        <section class="card">
+            <h2>Infra Backup</h2>
+            {{if .InfraBackup}}
+            <div class="info-grid">
+                <div class="info-item">
+                    <span class="label">Last Updated</span>
+                    <span class="value">{{.InfraBackupAge}}</span>
+                </div>
+                <div class="info-item">
+                    <span class="label">Deployed Stacks</span>
+                    <span class="value">{{.InfraBackup.StackCount}}</span>
+                </div>
+                <div class="info-item">
+                    <span class="label">Disks</span>
+                    <span class="value">{{.InfraBackup.DiskCount}}</span>
+                </div>
+            </div>
+            {{else}}
+            <p style="color: #facc15">No infra backup received yet</p>
+            {{end}}
+        </section>
+
         <!-- Health -->
         <section class="card">
             <h2>Health</h2>