fix(serial): avoid USB Serial JTAG cold-boot blocking

[xuchang-vivo]

Summary

• Prevent USB-Serial-JTAG console writes from blocking before the host enumerates the device.
• Skip early-console bytes while the USB IN endpoint is busy instead of waiting with interrupts disabled.
• Enable the USB serial console option for ESP32-C3 debug and release defconfigs.

Scope

• Based directly on main.

Testing

• Not run locally; repository instructions prohibit unrequested build commands.
• Please rely on CI for compilation checks.

[xuchang-vivo]

build_prs

[github-actions]

Job is started, see https://github.com/vivoblueos/kernel/actions/runs/33623589166.

[github-actions]

✅ All jobs completed successfully, see https://github.com/vivoblueos/kernel/actions/runs/33623589166.