refactor: cleanup duplicate code

[cqjjjzr]

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Summary

Fix 36171.

Consolidated duplicated API helper logic by:

1. moving repeated timestamp normalization into libs.helper.to_timestamp
2. sharing human-input default value serialization
3. extracting common DSL version compatibility checks
4. replaced duplicate trigger refresh timestamp helpers with libs.helper.current_timestamp

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	2026-05-14 10:26:43.316131764 +0000
+++ /tmp/pyrefly_pr.txt	2026-05-14 10:26:31.596198234 +0000
@@ -1,7 +1,7 @@
 ERROR `str` is not assignable to `Literal['advanced-chat', 'agent-chat', 'all', 'channel', 'chat', 'completion', 'workflow']` [bad-assignment]
   --> controllers/console/app/app.py:70:104
 ERROR Object of class `App` has no attribute `access_mode` [missing-attribute]
-   --> controllers/console/app/app.py:590:13
+   --> controllers/console/app/app.py:584:13
 ERROR Argument `str | None` is not assignable to parameter `language` with type `str` in function `services.account_service.AccountService.send_email_register_email` [bad-argument-type]
   --> controllers/console/auth/email_register.py:73:108
 ERROR Object of class `MissingRouter` has no attribute `get` [missing-attribute]
@@ -861,15 +861,15 @@
 ERROR Object of class `NoneType` has no attribute `id` [missing-attribute]
    --> tests/test_containers_integration_tests/services/test_app_dsl_service.py:161:42
 ERROR Argument `Literal['simple']` is not assignable to parameter `prompt_type` with type `PromptType | SQLCoreOperations[PromptType]` in function `models.model.AppModelConfig.__init__` [bad-argument-type]
-   --> tests/test_containers_integration_tests/services/test_app_dsl_service.py:920:25
+   --> tests/test_containers_integration_tests/services/test_app_dsl_service.py:923:25
 ERROR Argument `Literal['workflow']` is not assignable to parameter `value` with type `AppMode | SQLCoreOperations[AppMode]` in function `sqlalchemy.orm.base.Mapped.__set__` [bad-argument-type]
-   --> tests/test_containers_integration_tests/services/test_app_dsl_service.py:943:20
+   --> tests/test_containers_integration_tests/services/test_app_dsl_service.py:946:20
 ERROR Argument `Literal['workflow']` is not assignable to parameter `value` with type `AppMode | SQLCoreOperations[AppMode]` in function `sqlalchemy.orm.base.Mapped.__set__` [bad-argument-type]
-   --> tests/test_containers_integration_tests/services/test_app_dsl_service.py:978:20
+   --> tests/test_containers_integration_tests/services/test_app_dsl_service.py:981:20
 ERROR Argument `Literal['workflow']` is not assignable to parameter `value` with type `AppMode | SQLCoreOperations[AppMode]` in function `sqlalchemy.orm.base.Mapped.__set__` [bad-argument-type]
-    --> tests/test_containers_integration_tests/services/test_app_dsl_service.py:1019:20
+    --> tests/test_containers_integration_tests/services/test_app_dsl_service.py:1022:20
 ERROR Argument `list[SimpleNamespace]` is not assignable to parameter `dsl_dependencies` with type `list[PluginDependency]` in function `services.app_dsl_service.AppDslService.get_leaked_dependencies` [bad-argument-type]
-    --> tests/test_containers_integration_tests/services/test_app_dsl_service.py:1305:73
+    --> tests/test_containers_integration_tests/services/test_app_dsl_service.py:1308:73
 ERROR Object of class `NoneType` has no attribute `id` [missing-attribute]
    --> tests/test_containers_integration_tests/services/test_app_generate_service.py:188:38
 ERROR Object of class `NoneType` has no attribute `id` [missing-attribute]

[github-actions]

Pyrefly Type Coverage

Metric	Base	PR	Delta
Type coverage	0.00%	43.69%	+43.69%
Strict coverage	0.00%	43.21%	+43.21%
Typed symbols	0	22,038	+22,038
Untyped symbols	0	28,717	+28,717
Modules	0	2553	+2,553