sinohqb 0e1ab75d77 feat(campaign): reverse time-scale input as target runtime ... Users now pick a window length + "how long it should actually take" and the form derives time_scale (window ÷ target), showing 倍速 ×N and 加速后耗时 read-only; a 实时 switch pins real wall-clock (×1). Validation blocks a target longer than the window. List/detail display accelerated duration instead of raw ×N. POST /campaigns contract unchanged. (v0.6 ticket 07)		2026-07-31 16:55:43 +08:00
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web	feat(campaign): reverse time-scale input as target runtime	2026-07-31 16:55:43 +08:00