add conversation expire config & user query text to dingtalk card (#2147)

* add conversation expire config

* add user query text to card

* fix(pipeline): move session limit to AI config

* test(pipeline): cover AI session limit config

* refactor(pipeline): merge session expire-time into AI runner stage

Move the session validity duration field out of the standalone
session-limit stage into the runner stage so it actually renders in the
AI tab (the tab only shows the runner stage and the stage matching the
selected runner — any other stage is filtered out). Read path, default
config, metadata description, and tests updated accordingly.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(pipeline): expire conversations from last update time

* fix(n8n): sync generated conversation id into payload

---------

Co-authored-by: RockChinQ <rockchinq@gmail.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/langbot/templates/default-pipeline-config.json

@@ -38,7 +38,8 @@
     },
     "ai": {
         "runner": {
-            "runner": "local-agent"
+            "runner": "local-agent",
+            "expire-time": 0
         },
         "local-agent": {
             "model": {

src/langbot/templates/metadata/pipeline/ai.yaml

@@ -47,6 +47,26 @@ stages:
             label:
               en_US: Langflow API
               zh_Hans: Langflow API
+      - name: expire-time
+        label:
+          en_US: Conversation expire time (seconds)
+          zh_Hans: 单个对话过期时间（秒）
+        description:
+          en_US: >-
+            Maximum idle time of a single conversation, measured from the last
+            message/preprocess update time. When a new message arrives and the
+            current conversation has been idle for longer than this value, the
+            existing external conversation id is discarded and a new one is
+            started automatically — the user does not need to trigger a reset
+            manually. Set to 0 to disable expiry (conversations live until the
+            user or another mechanism resets them).
+          zh_Hans: >-
+            单个对话的最长空闲时间，从最后一条消息/preprocess 更新时间开始计算。
+            当新消息到达且当前对话空闲时间已超过该值时，旧的外部对话 ID 会被自动丢弃并开启新对话，
+            用户无需手动重置。设置为 0 表示不限制过期时间（对话会一直保留，直到用户或其他机制主动重置）。
+        type: integer
+        required: true
+        default: 0
   - name: local-agent
     label:
       en_US: Local Agent
@@ -539,4 +559,4 @@ stages:
           zh_Hans: 可选的流程调整参数
         type: json
         required: false
-        default: '{}'
+        default: '{}'

src/langbot/templates/metadata/pipeline/safety.yaml

@@ -72,4 +72,4 @@ stages:
           - name: wait
             label:
               en_US: Wait
-              zh_Hans: 等待
+              zh_Hans: 等待