feat：优化timing门控逻辑，减少消耗，提高速度

prompts/en-US/hippo_topic_summary.prompt

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+Please summarize the following chat record segment based on the topic and extract the following information:
+
+**Topic**: {topic}
+
+**Requirements**:
+1. Keywords: extract keywords related to the topic and return them as a list (3-10 keywords)
+2. Summary: provide a plain-text summary of this segment (50-200 words). Requirements:
+   - Carefully retell the event and the chat content;
+   - Highlight the development process and the result of the event;
+   - Summarize around the central topic;
+   - Extract the key information points in the topic, and keep them concise and clear.
+
+Please return in JSON format as follows:
+{{
+    "keywords": ["keyword1", "keyword2", ...],
+    "summary": "summary content"
+}}
+
+Chat record:
+{original_text}
+
+Please return JSON directly and do not include any other content.