fix: fix imports

[wylswz]

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Summary

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint && make type-check (backend) and cd web && pnpm exec vp staged (frontend) to appease the lint gods

[github-actions]

Pyrefly Diff

base → PR

--- /tmp/pyrefly_base.txt	2026-05-11 09:13:53.359202751 +0000
+++ /tmp/pyrefly_pr.txt	2026-05-11 09:13:42.522120200 +0000
@@ -32,8 +32,6 @@
    --> core/app/task_pipeline/easy_ui_based_generate_task_pipeline.py:325:29
 ERROR Argument `list[Unknown]` is not assignable to parameter `value` with type `SQLCoreOperations[dict[str, Any]] | dict[str, Any]` in function `sqlalchemy.orm.base.Mapped.__set__` [bad-argument-type]
    --> core/app/task_pipeline/easy_ui_based_generate_task_pipeline.py:392:27
-ERROR Cannot find module `dify.api.configs` [missing-import]
- --> core/helper/credential_utils.py:5:1
 ERROR No matching overload found for function `core.model_manager.ModelInstance.invoke_llm` called with arguments: (prompt_messages=list[UserPromptMessage], model_parameters=dict[str, int], stream=Literal[False]) [no-matching-overload]
   --> core/llm_generator/llm_generator.py:73:60
 ERROR No matching overload found for function `core.model_manager.ModelInstance.invoke_llm` called with arguments: (prompt_messages=list[UserPromptMessage], model_parameters=dict[str, float | int], stream=Literal[False]) [no-matching-overload]
@@ -372,8 +370,6 @@
    --> dify_graph/nodes/base/node.py:398:32
 ERROR Object of class `BaseOxmlElement` has no attribute `body` [missing-attribute]
    --> dify_graph/nodes/document_extractor/node.py:446:19
-ERROR Could not import `sign_upload_file` from `core.tools.signature` [missing-module-attribute]
-  --> dify_graph/nodes/llm/node.py:19:34
 ERROR Object of class `NoneType` has no attribute `instrument_app` [missing-attribute]
    --> extensions/otel/instrumentation.py:103:5
 ERROR Object of class `NoneType` has no attribute `instrument` [missing-attribute]