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>

app/Http/Controllers/Admin/DocumentController.php

@@ -83,8 +83,8 @@ class DocumentController extends Controller
         $document = Document::create([
             'document_category_id' => $validated['document_category_id'],
             'title' => $validated['title'],
-            'document_number' => $validated['document_number'],
-            'description' => $validated['description'],
+            'document_number' => $validated['document_number'] ?? null,
+            'description' => $validated['description'] ?? null,
             'access_level' => $validated['access_level'],
             'status' => 'active',
             'created_by_user_id' => auth()->id(),
@@ -360,7 +360,7 @@ class DocumentController extends Controller
             ->get();
 
         // Monthly upload trends (last 6 months)
-        $uploadTrends = Document::selectRaw('DATE_FORMAT(created_at, "%Y-%m") as month, COUNT(*) as count')
+        $uploadTrends = Document::selectRaw("strftime('%Y-%m', created_at) as month, COUNT(*) as count")
             ->where('created_at', '>=', now()->subMonths(6))
             ->groupBy('month')
             ->orderBy('month', 'desc')