v1.3.2 — auto 额度被撤掉后的显示

Upstream now reports autoLimitEnabled: false / autoLimitUsd: 0 while
autoUsedUsd keeps climbing: the auto bucket is metered but uncapped.

• header chip renders usage only: auto $5.40 · 不限
• no percentage is invented for a bucket without a limit
• tool says "the API reports no monthly cap for this bucket" instead of
  calling it unconfigured
• same handling for the high-cost-model bucket