feat(重构): 实现新的渲染服务架构

- 新增 RenderTask

entity/effects/speed.py

@@ -0,0 +1,35 @@
+from typing import List
+from .base import EffectProcessor
+
+class SpeedEffect(EffectProcessor):
+    """视频变速效果处理器"""
+    
+    def validate_params(self) -> bool:
+        """验证参数：速度倍数"""
+        if not self.params:
+            return True  # 默认不变速
+            
+        try:
+            speed = float(self.params)
+            return speed > 0
+        except ValueError:
+            return False
+            
+    def generate_filter_args(self, video_input: str, effect_index: int) -> tuple[List[str], str]:
+        """生成变速效果的滤镜参数"""
+        if not self.validate_params():
+            return [], video_input
+            
+        if not self.params or self.params == "1":
+            return [], video_input  # 不需要变速
+            
+        speed = float(self.params)
+        output_stream = f"[v_eff{effect_index}]"
+        
+        # 使用setpts进行变速
+        filter_args = [f"{video_input}setpts={speed}*PTS{output_stream}"]
+        
+        return filter_args, output_stream
+        
+    def get_effect_name(self) -> str:
+        return "ospeed"