config: raise default summarization trigger before v2.0-m1 (#3174)

* config: update summarization configuration

* docs: sync summarization trigger guidance

frontend/src/content/en/harness/middlewares.mdx

@@ -162,7 +162,7 @@ summarization:
   # Trigger conditions — summarization runs when ANY threshold is met
   trigger:
     - type: tokens # trigger when context exceeds N tokens
-      value: 15564
+      value: 32000
     # - type: messages  # trigger when there are more than N messages
     #   value: 50
     # - type: fraction  # trigger when context exceeds X% of model max

frontend/src/content/zh/harness/middlewares.mdx

@@ -154,7 +154,7 @@ summarization:
   # 触发条件——满足任意一个条件时运行摘要
   trigger:
     - type: tokens # 当上下文超过 N 个 token 时触发
-      value: 15564
+      value: 32000
     # - type: messages  # 当消息数超过 N 时触发
     #   value: 50
     # - type: fraction  # 当上下文达到模型最大输入的 X% 时触发