docs: add CM5 power supply specification to README - #2013
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Fixes #267
Summary
Add the Radxa CM5 power supply specification to the CM5 README (both Chinese and English).
Changes
### 供电section### Power SupplysectionContent added:
Source / Verification
The 4V recommendation and 5V DC-DC whistling behavior are confirmed by the official document
radxa_cm5_carrier_board_design_note.pdf(§3.1 Power Supply) and the CM5 schematic (4V Power for RK3588S). The 3.6-5.2V input range and typical 2A current are consistent with the RK806 PMU-based power design of the CM5 module.Checklist