test: 통합 테스트 오류 및 경고 수정

- 모든 서비스 메서드 시그니처를 실제 구현에 맞게 수정
- TestDataGenerator 제거하고 직접 객체 생성으로 변경
- 모델 필드명 및 타입 불일치 수정
- 불필요한 Either 패턴 사용 제거
- null safety 관련 이슈 해결

수정된 파일:
- test/integration/screens/company_integration_test.dart
- test/integration/screens/equipment_integration_test.dart
- test/integration/screens/user_integration_test.dart
- test/integration/screens/login_integration_test.dart

.github/workflows/flutter_test.yml

@@ -0,0 +1,112 @@
+name: Flutter Test & Quality Check
+
+on:
+  push:
+    branches: [ main, develop ]
+  pull_request:
+    branches: [ main, develop ]
+
+jobs:
+  test:
+    name: Test on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+      
+    - name: Setup Flutter
+      uses: subosito/flutter-action@v2
+      with:
+        flutter-version: '3.x'
+        channel: 'stable'
+        
+    - name: Get dependencies
+      run: flutter pub get
+      
+    - name: Run build_runner
+      run: flutter pub run build_runner build --delete-conflicting-outputs
+      
+    - name: Analyze code
+      run: flutter analyze
+      
+    - name: Run unit tests
+      run: flutter test test/unit --coverage --reporter json > test-results-unit.json
+      continue-on-error: true
+      
+    - name: Run widget tests  
+      run: flutter test test/widget --coverage --reporter json > test-results-widget.json
+      continue-on-error: true
+      
+    - name: Run integration tests
+      run: flutter test test/integration --reporter json > test-results-integration.json
+      continue-on-error: true
+      
+    - name: Upload test results
+      uses: actions/upload-artifact@v3
+      if: always()
+      with:
+        name: test-results-${{ matrix.os }}
+        path: test-results-*.json
+        
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v3
+      if: matrix.os == 'ubuntu-latest'
+      with:
+        file: ./coverage/lcov.info
+        flags: unittests
+        name: codecov-umbrella
+        
+    - name: Generate test report
+      if: always()
+      run: |
+        echo "# Test Results Summary" > test-summary.md
+        echo "## Platform: ${{ matrix.os }}" >> test-summary.md
+        echo "### Unit Tests" >> test-summary.md
+        if [ -f test-results-unit.json ]; then
+          echo '```json' >> test-summary.md
+          cat test-results-unit.json | head -20 >> test-summary.md
+          echo '```' >> test-summary.md
+        fi
+        
+    - name: Comment PR with test results
+      uses: actions/github-script@v6
+      if: github.event_name == 'pull_request'
+      with:
+        script: |
+          const fs = require('fs');
+          const testSummary = fs.readFileSync('test-summary.md', 'utf8');
+          github.rest.issues.createComment({
+            issue_number: context.issue.number,
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            body: testSummary
+          });
+
+  build:
+    name: Build APK
+    runs-on: ubuntu-latest
+    needs: test
+    
+    steps:
+    - uses: actions/checkout@v3
+    
+    - uses: subosito/flutter-action@v2
+      with:
+        flutter-version: '3.x'
+        
+    - run: flutter pub get
+    
+    - run: flutter pub run build_runner build --delete-conflicting-outputs
+    
+    - name: Build APK
+      run: flutter build apk --release
+      
+    - name: Upload APK
+      uses: actions/upload-artifact@v3
+      with:
+        name: app-release
+        path: build/app/outputs/flutter-apk/app-release.apk