Offline-tolerant music-video merge

The merge no longer refuses when NAS is unreachable. DB changes always
run; per-side file operations are best-effort. When the NAS rename can't
happen it's recorded in a new pending_nas_moves table, and nas:auto-sync
drains the queue (rename + best-effort parent prune) once NAS is back,
retaining attempts/last_error on failure. Also plugs missing isEnabled()
guards on renameNasPath and deleteFolder so the merge cleanup path can't
hang on smbclient timeouts.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

database/migrations/2026_07_31_000003_create_pending_nas_moves_table.php

@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        // Records file/folder moves that were queued while NAS was
+        // unreachable. `nas:auto-sync` drains rows when NAS is back:
+        // for each row it renames from → to on NAS and deletes the row.
+        Schema::create('pending_nas_moves', function (Blueprint $table) {
+            $table->id();
+            $table->string('from_path', 500);
+            $table->string('to_path', 500);
+            $table->string('kind', 24)->default('folder'); // 'folder' or 'file'
+            $table->string('origin', 40)->default('merge'); // where it came from
+            $table->unsignedInteger('attempts')->default(0);
+            $table->timestamp('last_attempt_at')->nullable();
+            $table->text('last_error')->nullable();
+            $table->timestamps();
+
+            $table->index(['origin', 'created_at']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('pending_nas_moves');
+    }
+};