feat: Add AI report generation with DIFY integration

- Add Users table for display name resolution from AD authentication
- Integrate DIFY AI service for report content generation
- Create docx assembly service with image embedding from MinIO
- Add REST API endpoints for report generation and download
- Add WebSocket notifications for generation progress
- Add frontend UI with progress modal and download functionality
- Add integration tests for report generation flow

Report sections (Traditional Chinese):
- 事件摘要 (Summary)
- 時間軸 (Timeline)
- 參與人員 (Participants)
- 處理過程 (Resolution Process)
- 目前狀態 (Current Status)
- 最終處置結果 (Final Resolution)

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

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

.env.example

@@ -21,3 +21,13 @@ MINIO_ACCESS_KEY=minioadmin
 MINIO_SECRET_KEY=minioadmin
 MINIO_BUCKET=task-reporter-files
 MINIO_SECURE=false  # Set to true for HTTPS in production
+
+# DIFY AI Service Configuration
+# Used for AI-powered incident report generation
+DIFY_BASE_URL=https://dify.theaken.com/v1
+DIFY_API_KEY=  # Required: Get from DIFY console
+DIFY_TIMEOUT_SECONDS=120  # Timeout for AI generation requests
+
+# Report Generation Settings
+REPORT_MAX_MESSAGES=200  # Summarize older messages if room exceeds this count
+REPORT_STORAGE_PATH=reports  # MinIO path prefix for generated reports