refactor: optimized error handling (#2020)

* Update output.yaml

* Update default-pipeline-config.json

* Update chat.py

* Add files via upload

* Update chat.py

* Update default-pipeline-config.json

* Update output.yaml

* Update constants.py

* feat: update logic

* fix: update required database version to 21

---------

Co-authored-by: Junyan Qin <rockchinq@gmail.com>

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

@@ -95,11 +95,12 @@
             "max": 0
         },
         "misc": {
-            "hide-exception": true,
+            "exception-handling": "show-hint",
+            "failure-hint": "Request failed.",
             "at-sender": true,
             "quote-origin": true,
             "track-function-calls": false,
             "remove-think": false
         }
     }
-}
+}

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

@@ -78,13 +78,39 @@ stages:
       en_US: Misc
       zh_Hans: 杂项
     config:
-      - name: hide-exception
+      - name: exception-handling
         label:
-          en_US: Hide Exception
-          zh_Hans: 不输出异常信息给用户
-        type: boolean
+          en_US: Exception Handling Strategy
+          zh_Hans: 异常处理策略
+        description:
+          en_US: Controls how error messages are displayed to the user when an AI request fails
+          zh_Hans: 控制 AI 请求失败时向用户展示错误信息的方式
+        type: select
         required: true
-        default: true
+        default: show-hint
+        options:
+          - name: show-error
+            label:
+              en_US: Show Full Error
+              zh_Hans: 显示完整报错信息
+          - name: show-hint
+            label:
+              en_US: Show Failure Hint
+              zh_Hans: 仅文字提示
+          - name: hide
+            label:
+              en_US: Hide All
+              zh_Hans: 不显示任何异常信息
+      - name: failure-hint
+        label:
+          en_US: Failure Hint Text
+          zh_Hans: 失败提示文本
+        description:
+          en_US: The text to display when a request fails. Only effective when Exception Handling Strategy is set to "Show Failure Hint"
+          zh_Hans: 请求失败时显示的提示文本，仅在异常处理策略设置为"仅文字提示"时生效
+        type: string
+        required: false
+        default: 'Request failed.'
       - name: at-sender
         label:
           en_US: At Sender
@@ -119,3 +145,4 @@ stages:
         type: boolean
         required: true
         default: false
+