feat: customer relationship view, idempotency keys, approval decline, seed payments, backlog cleanup

- #3: Wire ApprovalModal handleDecline to POST /api/admin/bookings/{id}/cancel
- #25: New GET /api/admin/users/{id}/relationship endpoint with spend, tips, visits, customer-for duration, top services
- #25: UserModal reorganized — Personal Info, Booking History, Customer Relationship, Loyalty, Patch Tests
- #36: Idempotency keys on user and admin booking creation (UUID header, duplicate detection)
- local-dev-2.sh: seed payments via PL/pgSQL for completed bookings (5 randomized scenarios)
- local-dev-2.sh: shrink guest/time-blocker output, add payments to summary
- Backlog: mark #3/#25/#35/#36/#49 done, plan #36/#45, remove #46/#48, update #45 with milestone campaigns
- Remove notes history table, avg visits/year metric, Account Information, Privacy & Consent from UserModal

obsidian/.obsidian/workspace.json

@@ -13,12 +13,12 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "Crussell/Test Implementation Plan.md",
+                "file": "Crussell/Future Work - Gap Backlog.md",
                 "mode": "source",
                 "source": false
               },
               "icon": "lucide-file",
-              "title": "Test Implementation Plan"
+              "title": "Future Work - Gap Backlog"
             }
           }
         ]
@@ -94,7 +94,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "Express.js Cheat Sheet.md",
+                "file": "Crussell/Future Work - Gap Backlog.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -104,7 +104,7 @@
                 "unlinkedCollapsed": true
               },
               "icon": "links-coming-in",
-              "title": "Backlinks for Express.js Cheat Sheet"
+              "title": "Backlinks for Future Work - Gap Backlog"
             }
           },
           {
@@ -171,8 +171,8 @@
   },
   "active": "0e456d61bc5b6ded",
   "lastOpenFiles": [
-    "Crussell/Future Work - Gap Backlog.md",
     "Crussell/Test Implementation Plan.md",
+    "Crussell/Future Work - Gap Backlog.md",
     "Crussell/Crussell Nails.md",
     "Crussell/Backend/bookings.md",
     "Untitled.base",