Fix duplicate changedOrderToJob migration blocking build

Two divergent copies of this branch each independently regenerated an
EF migration named changedOrderToJob, and merging both left two files
with the same C# class name (compile error) plus an orphaned
fixedOrderCustomerID migration referencing the already-renamed orders
table. Removed the dead/unapplied migrations, committed the two
migrations already live on the shared dev DB, and added
FixJobsCustomerIdType to bring jobs.customer_id in line with the model
(text -> integer) using an explicit USING cast.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

barkmanui/src/common/components/BarkHeader.tsx

@@ -8,6 +8,7 @@ import BarkLogo from '@/assets/barklogo.png';
 const links = [
     { link: '/', label: 'Home' },
     { link: '/customers', label: 'Customers' },
+    { link: '/jobs', label: 'Jobs' },
     { link: '/inventory', label: 'Inventory' },
 ];