Add membership fee system with disability discount and fix document permissions

Features:
- Implement two fee types: entrance fee and annual fee (both NT$1,000)
- Add 50% discount for disability certificate holders
- Add disability certificate upload in member profile
- Integrate disability verification into cashier approval workflow
- Add membership fee settings in system admin

Document permissions:
- Fix hard-coded role logic in Document model
- Use permission-based authorization instead of role checks

Additional features:
- Add announcements, general ledger, and trial balance modules
- Add income management and accounting entries
- Add comprehensive test suite with factories
- Update UI translations to Traditional Chinese

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

database/factories/DocumentCategoryFactory.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Database\Factories;
+
+use App\Models\DocumentCategory;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+class DocumentCategoryFactory extends Factory
+{
+    protected $model = DocumentCategory::class;
+
+    public function definition(): array
+    {
+        return [
+            'name' => $this->faker->unique()->words(2, true),
+            'slug' => $this->faker->unique()->slug(2),
+            'description' => $this->faker->sentence(),
+            'icon' => $this->faker->randomElement(['📄', '📁', '📋', '📊', '📈']),
+            'sort_order' => $this->faker->numberBetween(1, 100),
+            'default_access_level' => $this->faker->randomElement(['public', 'members', 'admin', 'board']),
+        ];
+    }
+}