fix(scripts): 修正日报发送标题及文本内容

- 将发送图文消息的标题由“ETF轮动策略日报”改为“ETF轮动策略调仓日报”
- 调整发送图文消息中文本内容，去除默认提示
- 发送报告时不再传递固定摘要文本，改为传空字符串
- 修复了每日任务中报告发送的文本逻辑问题

scripts/daily_scheduler.py

@@ -166,8 +166,8 @@ def send_report_to_dingtalk(chart_path: str, summary_text: str = "") -> bool:
         # 发送图文消息
         success = bot.send_image_via_oss(
             image_path=chart_path,
-            title=f"ETF轮动策略日报 ({today_str})",
-            text=summary_text or f"今日调仓信号已生成",
+            title=f"ETF轮动策略调仓日报 ({today_str})",
+            text=summary_text,
             expire_days=7,
         )
 
@@ -233,7 +233,7 @@ def daily_task(config_path: str = "config/strategies/rotation.yaml"):
     # 3. 发送报告
     if result.get("chart_path"):
         send_report_to_dingtalk(
-            chart_path=result["chart_path"], summary_text="今日ETF轮动策略调仓信号"
+            chart_path=result["chart_path"], summary_text=""
         )
     else:
         logger.warning("未找到报告图表")