feat(invoices): add indexes, pagination, and client name enrichment

- Add database migration 0024 with indexes on invoices, invoice_line_items, and invoice_tip_splits
- Update Drizzle schema with index definitions for sync
- Add pagination (limit/offset) to GET /api/invoices with max 200 limit
- Add LEFT JOIN to include clientName in invoice list response
- Return { data: [...], total: N } response shape for pagination

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/db/migrations/0024_invoice_indexes.sql

@@ -0,0 +1,5 @@
+CREATE INDEX idx_invoices_client_id ON invoices(client_id);
+CREATE INDEX idx_invoices_status ON invoices(status);
+CREATE INDEX idx_invoices_created_at ON invoices(created_at);
+CREATE INDEX idx_invoice_line_items_invoice_id ON invoice_line_items(invoice_id);
+CREATE INDEX idx_invoice_tip_splits_invoice_id ON invoice_tip_splits(invoice_id);

packages/db/migrations/meta/_journal.json

@@ -169,6 +169,13 @@
       "when": 1775309667192,
       "tag": "0023_auth_provider_config",
       "breakpoints": true
+    },
+    {
+      "idx": 24,
+      "version": "7",
+      "when": 1775396067192,
+      "tag": "0024_invoice_indexes",
+      "breakpoints": true
     }
   ]
 }