Add v3.0 upgrade migration

Migrates media disk references from the old temp_{driver} naming to
the new disk_{id} scheme. System local disks map to 'local', remote
disks map to 'disk_{id}'. Structured as the single v3.0 upgrade
migration for future additions.

database/migrations/2026_04_07_001104_upgrade_to_v3.php

@@ -0,0 +1,63 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration
+{
+    /**
+     * Upgrade data for v3.0.
+     */
+    public function up(): void
+    {
+        $this->migrateMediaDiskReferences();
+    }
+
+    /**
+     * v3.0 replaced the temp_{driver} disk naming with disk_{id}.
+     * Update existing media records so they reference valid disk names.
+     */
+    private function migrateMediaDiskReferences(): void
+    {
+        // temp_local was the dynamic name for the default local FileDisk.
+        // In v3.0, system local disks use the 'local' config entry directly.
+        DB::table('media')
+            ->where('disk', 'temp_local')
+            ->update(['disk' => 'local']);
+
+        // temp_s3, temp_dropbox, etc. for remote disks — map to disk_{id}
+        $remotePrefixes = ['temp_s3', 'temp_dropbox', 'temp_doSpaces', 'temp_s3compat'];
+
+        foreach ($remotePrefixes as $oldDiskName) {
+            $driver = str_replace('temp_', '', $oldDiskName);
+
+            $fileDisk = DB::table('file_disks')
+                ->where('driver', $driver)
+                ->first();
+
+            if ($fileDisk) {
+                DB::table('media')
+                    ->where('disk', $oldDiskName)
+                    ->update(['disk' => 'disk_'.$fileDisk->id]);
+            }
+        }
+    }
+
+    public function down(): void
+    {
+        // Reverse: map disk_{id} back to temp_{driver}
+        $fileDiskIds = DB::table('file_disks')
+            ->whereNotIn('type', ['SYSTEM'])
+            ->get();
+
+        foreach ($fileDiskIds as $disk) {
+            DB::table('media')
+                ->where('disk', 'disk_'.$disk->id)
+                ->update(['disk' => 'temp_'.$disk->driver]);
+        }
+
+        DB::table('media')
+            ->where('disk', 'local')
+            ->update(['disk' => 'temp_local']);
+    }
+};