refactor: 重构图片检测功能，拆分组件并优化返回格式

1. 后端api修改：将图片结果返回从文件路径改为base64格式，移除本地文件存储
2. 新增图片检测组件ImageDetection.vue，封装独立的图片检测UI逻辑
3. 重构Home页面，使用tab切换图片/视频检测模块，简化原有布局
4. 更新web包名与rollup依赖版本

apps/server/api/detection.py

@@ -36,18 +36,17 @@ async def detect_image(
         
         if result['success']:
             annotated_frame = detection_service.draw_detections(frame, result['detections'])
-            
-            import uuid
-            result_filename = f"result_{uuid.uuid4().hex[:8]}.jpg"
-            result_path = f"static/results/{result_filename}"
-            cv2.imwrite(result_path, annotated_frame)
-            
+
+            # 将标注后的图片转换为 base64
+            _, buffer = cv2.imencode('.jpg', annotated_frame)
+            img_base64 = base64.b64encode(buffer).decode('utf-8')
+
             return ImageDetectionResult(
                 success=True,
                 message="检测完成",
                 data={
                     "detections": result['detections'],
-                    "image_url": f"/static/results/{result_filename}",
+                    "image_base64": img_base64,
                     "stats": result['stats']
                 }
             )