Add LaborCategory resource — manage labor categories from UI

- Creates labor_categories table (company-scoped) seeded with 11 defaults
- LaborCategory model with BelongsToTenant
- Full Filament CRUD resource with drag-to-reorder (sort_order)
- LaborResource category Select now reads from DB instead of hardcoded const
- Navigation: 'Categorii manopere' in Service group, sort 33

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

database/migrations/2026_09_07_110000_create_labor_categories_table.php

@@ -0,0 +1,50 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('labor_categories', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('company_id')->constrained()->cascadeOnDelete();
+            $table->string('name');
+            $table->unsignedSmallInteger('sort_order')->default(0);
+            $table->timestamps();
+
+            $table->unique(['company_id', 'name']);
+            $table->index('company_id');
+        });
+
+        // Seed default categories for all existing companies
+        $defaults = [
+            'Motor', 'Frâne', 'Suspensie', 'Anvelope', 'ITP',
+            'Cutie viteze', 'Caroserie', 'Electrică', 'Climatizare',
+            'Eșapament', 'Altele',
+        ];
+
+        $companies = DB::table('companies')->pluck('id');
+        $now = now();
+
+        foreach ($companies as $companyId) {
+            foreach ($defaults as $i => $name) {
+                DB::table('labor_categories')->insertOrIgnore([
+                    'company_id' => $companyId,
+                    'name'       => $name,
+                    'sort_order' => $i,
+                    'created_at' => $now,
+                    'updated_at' => $now,
+                ]);
+            }
+        }
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('labor_categories');
+    }
+};