feat: per-account User-Agent for Antigravity to reduce ban risk - #15
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Every Antigravity request previously sent one hardcoded client UA (antigravity/hub/2.9.1 darwin/arm64), so a whole pool of accounts sharing a server IP fingerprinted as a single identical client. Derive a stable UA per account from a small pool of realistic client strings (varying only os/arch, never inventing versions): the same account always reports the same client like a real single-device user, while different accounts spread across the pool. Also stamp the UA on the Google token refresh/exchange calls so they no longer leak the default Go-http-client agent. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Summary
antigravity/hub/2.9.1 darwin/arm64），整个账号池共用一个服务器 IP + 同一 UA，容易被判定为异常客户端Go-http-clientTesting
go vet ./cmd/capi通过go test ./cmd/capi全部通过（含新增TestAntigravityUserAgentForIsStableAndSpread）后端改动，无前端/dist 变化。
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