feat: Support hidden global variables

[mmagi]

全局变量支持设置为隐藏，不必在对话开始前填写

[gru-agent]

TestGru Assignment

Summary

Link	CommitId	Status	Reason
Detail	b619eb0	🚫 Skipped	No files need to be tested {"packages/global/core/app/type.d.ts":"File path does not match include patterns.","packages/web/i18n/en/workflow.json":"File path does not match include patterns.","packages/web/i18n/zh-CN/workflow.json":"File path does not match include patterns.","packages/web/i18n/zh-Hant/workflow.json":"File path does not match include patterns.","projects/app/src/components/core/chat/ChatContainer/ChatBox/components/VariableInput.tsx":"File path does not match include patterns.","projects/app/src/components/core/chat/ChatContainer/ChatBox/index.tsx":"File path does not match include patterns.","projects/app/src/pageComponents/app/detail/WorkflowComponents/Flow/nodes/NodePluginIO/InputTypeConfig.tsx":"File path does not match include patterns."}

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[c121914yu]

我认为新增一种类型更合适，我们会再系统设计下全局变量类型。