feat(screenshot): 截图工具加 Snipaste 式标注工具栏 (#1571) #101

Job	Run time
Python lint (ruff + async-blocking + no-loguru + no-tkinter + no-temperature + prompt-hygiene)	28s
Python conventions (i18n-sync + docs + api-trailing-slash×2 + module-layering)	21s
	49s

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