chore: add migration 0008 for payments, recurring invoices, and public links

Adds invoice_payment, recurring_invoice, recurring_invoice_item tables and
publicToken/lastReminderSentAt/invoicePrefix columns to invoice. Uses
IF NOT EXISTS guards since invoicePrefix may have been applied via db:push.

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

drizzle/meta/_journal.json

@@ -57,6 +57,13 @@
       "when": 1777339000000,
       "tag": "0007_invoice_email_message",
       "breakpoints": true
+    },
+    {
+      "idx": 8,
+      "version": "7",
+      "when": 1747526400000,
+      "tag": "0008_payments_recurring_public_links",
+      "breakpoints": true
     }
   ]
-}
+}