refactor(task): 重构任务参数处理逻辑

- 新增 filterTaskParams 方法，用于过滤模板所需的源数据
- 新增 getTaskParams 方法，用于获取任务参数并进行预处理
- 优化了视频源和图片源的处理逻辑，提高了代码可读性和可维护性
- 重构了任务回调中的源数据处理流程，使用新方法替代原有逻辑

src/main/java/com/ycwl/basic/biz/TemplateBiz.java

@@ -15,7 +15,9 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
 import java.util.Arrays;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import java.util.Objects;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.stream.Collectors;
@@ -121,4 +123,39 @@ public class TemplateBiz {
         return count >= minimalPlaceholderFill;
     }
 
+    public Map<String, List<SourceEntity>> filterTaskParams(Long templateId, Map<String, List<SourceEntity>> allTaskParams) {
+        if (allTaskParams == null || allTaskParams.isEmpty()) {
+            return Map.of();
+        }
+
+        List<String> templatePlaceholders = templateRepository.getTemplatePlaceholder(templateId);
+        if (templatePlaceholders == null || templatePlaceholders.isEmpty()) {
+            log.info("filterTaskParams: templateId:{} has no placeholders", templateId);
+            return Map.of();
+        }
+
+        Map<String, List<SourceEntity>> filteredParams = new HashMap<>();
+
+        for (String placeholder : templatePlaceholders) {
+            if (placeholder.startsWith("P")) {
+                // 图片源：占位符格式为 "P{deviceId}"
+                String imageKey = placeholder;
+                if (allTaskParams.containsKey(imageKey)) {
+                    filteredParams.put(imageKey, allTaskParams.get(imageKey));
+                }
+            } else {
+                // 视频源：占位符直接对应设备ID
+                String videoKey = placeholder;
+                if (allTaskParams.containsKey(videoKey)) {
+                    filteredParams.put(videoKey, allTaskParams.get(videoKey));
+                }
+            }
+        }
+
+        log.info("filterTaskParams: templateId:{}, original keys:{}, filtered keys:{}", 
+                templateId, allTaskParams.keySet().size(), filteredParams.keySet().size());
+        
+        return filteredParams;
+    }
+
 }