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>

tests/Feature/Validation/MemberValidationTest.php

@@ -0,0 +1,120 @@
+<?php
+
+namespace Tests\Feature\Validation;
+
+use App\Http\Middleware\VerifyCsrfToken;
+use App\Models\Member;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Mail;
+use Tests\TestCase;
+use Tests\Traits\CreatesMemberData;
+use Tests\Traits\SeedsRolesAndPermissions;
+
+/**
+ * Member Validation Tests
+ *
+ * Tests validation rules for member registration and model behavior.
+ */
+class MemberValidationTest extends TestCase
+{
+    use RefreshDatabase, SeedsRolesAndPermissions, CreatesMemberData;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        Mail::fake();
+        $this->seedRolesAndPermissions();
+    }
+
+    public function test_member_can_be_created(): void
+    {
+        $member = $this->createMember(['full_name' => 'Test Member']);
+
+        $this->assertDatabaseHas('members', ['full_name' => 'Test Member']);
+    }
+
+    public function test_member_defaults_to_pending_status(): void
+    {
+        $member = $this->createPendingMember();
+
+        $this->assertEquals(Member::STATUS_PENDING, $member->membership_status);
+    }
+
+    public function test_member_can_be_activated(): void
+    {
+        $member = $this->createActiveMember();
+
+        $this->assertEquals(Member::STATUS_ACTIVE, $member->membership_status);
+    }
+
+    public function test_member_can_be_expired(): void
+    {
+        $member = $this->createExpiredMember();
+
+        $this->assertEquals(Member::STATUS_EXPIRED, $member->membership_status);
+    }
+
+    public function test_member_has_user_relationship(): void
+    {
+        $member = $this->createMember();
+
+        $this->assertNotNull($member->user);
+        $this->assertInstanceOf(User::class, $member->user);
+    }
+
+    public function test_email_uniqueness_in_users_table(): void
+    {
+        User::factory()->create(['email' => 'existing@example.com']);
+
+        $data = $this->getValidMemberRegistrationData(['email' => 'existing@example.com']);
+        $response = $this->withoutMiddleware(VerifyCsrfToken::class)
+            ->post(route('register.member.store'), $data);
+
+        $response->assertSessionHasErrors('email');
+    }
+
+    public function test_email_uniqueness_in_members_table(): void
+    {
+        $existingMember = $this->createMember(['email' => 'member@example.com']);
+
+        $data = $this->getValidMemberRegistrationData(['email' => 'member@example.com']);
+        $response = $this->withoutMiddleware(VerifyCsrfToken::class)
+            ->post(route('register.member.store'), $data);
+
+        $response->assertSessionHasErrors('email');
+    }
+
+    public function test_membership_payment_can_be_created(): void
+    {
+        $data = $this->createMemberWithPendingPayment();
+
+        $this->assertNotNull($data['payment']);
+        $this->assertEquals($data['member']->id, $data['payment']->member_id);
+    }
+
+    public function test_members_have_unique_ids(): void
+    {
+        $member1 = $this->createMember();
+        $member2 = $this->createMember();
+
+        $this->assertNotEquals($member1->id, $member2->id);
+    }
+
+    public function test_active_member_has_paid_membership(): void
+    {
+        $member = $this->createActiveMember([
+            'membership_started_at' => now()->subMonth(),
+            'membership_expires_at' => now()->addYear(),
+        ]);
+
+        $this->assertTrue($member->hasPaidMembership());
+    }
+
+    public function test_pending_member_does_not_have_paid_membership(): void
+    {
+        $member = $this->createPendingMember();
+
+        $this->assertFalse($member->hasPaidMembership());
+    }
+}