Add repairs domain with tickets, line items, batches, and service templates

Full-stack implementation of instrument repair tracking: DB schema with
repair_ticket, repair_line_item, repair_batch, and repair_service_template
tables. Backend services and routes with pagination/search/sort. 20 API
tests covering CRUD, status workflow, line items, and batch operations.
Admin frontend with ticket list, detail with status progression, line item
management, batch list/detail with approval workflow, and new ticket form
with searchable account picker and intake photo uploads.

packages/backend/src/db/migrations/meta/_journal.json

@@ -106,6 +106,20 @@
       "when": 1774740000000,
       "tag": "0014_user_is_active",
       "breakpoints": true
+    },
+    {
+      "idx": 15,
+      "version": "7",
+      "when": 1774750000000,
+      "tag": "0015_repairs",
+      "breakpoints": true
+    },
+    {
+      "idx": 16,
+      "version": "7",
+      "when": 1774760000000,
+      "tag": "0016_repair_service_templates",
+      "breakpoints": true
     }
   ]
 }