chore(comments): re-point dangling supabase/migrations breadcrumbs

The Supabase purge deleted the archived supabase/migrations/.archived/
directory, but 12 src/ files still referenced its files by path in
JSDoc / TODO comments. The references were misleading (pointing to
deleted files), so re-point them at the canonical location of those
RPCs in db/migrations/0001_init.sql. No code or behavior changes.

Also fixed a stray 'supabase shim returns empty results' comment in
src/app/admin/page.tsx (the shim was already removed in Step 3 of
the refactor).

src/app/admin/page.tsx

@@ -32,7 +32,7 @@ export default async function AdminPage() {
   // so a transient DB/network failure can't crash the whole admin page.
   let dashboardBrandId: string | null = adminUser ? await getActiveBrandId(adminUser) : null;
   if (!dashboardBrandId && adminUser?.role === "platform_admin") {
-    // Direct pg query (the supabase shim returns empty results).
+    // Direct pg query (the legacy query-builder shim returned empty results).
     // This ensures a platform_admin sees real dashboard stats even on first login
     // before they have chosen an active brand.
     try {

src/app/api/wholesale/checkout/route.ts

@@ -4,7 +4,8 @@
  * TODO(migration): wholesale_orders is part of the legacy schema and
  * is read/written via raw `pool.query` SQL. The `get_wholesale_settings`
  * and `get_payment_settings` SECURITY DEFINER RPCs still live in the
- * database (see supabase/migrations/046 and 045) and are also called
+ * database (originally from the now-archived supabase migrations;
+ * consolidated into `db/migrations/0001_init.sql`) and are also called
  * via `pool.query`. When wholesale is reactivated, declare the tables
  * in `db/schema/wholesale.ts` and switch the reads to typed Drizzle.
  */

src/app/api/wholesale/price-sheet/route.ts

@@ -5,10 +5,10 @@
  * `enqueue_wholesale_notification` SECURITY DEFINER RPC live in the
  * legacy schema. Reads are converted to `pool.query`; the
  * `enqueue_wholesale_notification` RPC is still in the database
- * (supabase/migrations/054) and is called via `pool.query` rather
- * than the Supabase REST gateway. When wholesale is reactivated,
- * move the tables into `db/schema/wholesale.ts` and switch reads to
- * typed Drizzle.
+ * (originally from the now-archived supabase migrations; consolidated
+ * into `db/migrations/0001_init.sql`) and is called via `pool.query`.
+ * When wholesale is reactivated, move the tables into
+ * `db/schema/wholesale.ts` and switch reads to typed Drizzle.
  */
 
 import { NextRequest, NextResponse } from "next/server";