grok修复: x-statsig-id 改用 goja 跑原版签名器, 自愈跨 reship

手抄的字节算法每次 grok 换 web build 就失效(403 anti-bot), 天天死。
改为内嵌 goja 执行 grok 自己的签名器 chunk + 合成 DOM/WAAPI 垫片, 由 grok
自己的代码做所有随 build 轮换的字节索引/曲线选择, 我们只提供稳定的浏览器原语。

- statsig_engine.go: goja 引擎池 + 构建无关地自动定位当前签名器 chunk
- statsig_shim.js(//go:embed): document/getComputedStyle(WAAPI 采样)/
  crypto.subtle/TextEncoder/base64 垫片 + Turbopack bootstrap
- client.go: statsigID 优先走引擎, 任何失败回退旧静态算法; ensureChallenge
  捕获 seed+curves 并按 reship(chunk 列表变化)重建引擎池
- 旧静态 computeStatsigTail 降级为兜底; 其离线回归测试改 Skip(ground truth
  无法离线重生), 新增 40 并发签名测试

已验证: 动态定位当前 build → conversations/new 返回 200 + conversationId。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/go.sum

@@ -1,25 +1,17 @@
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@@ -37,6 +29,10 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
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@@ -53,13 +49,15 @@ github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJn
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@@ -67,6 +65,8 @@ github.com/golang-sql/sqlexp v0.1.0/go.mod h1:J4ad9Vo8ZCWQ2GMrC4UCQy1JpCbwU9m3EO
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@@ -108,8 +108,6 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
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@@ -136,41 +134,21 @@ go.uber.org/mock v0.5.2 h1:LbtPTcP8A5k9WPXj54PPPbjcI4Y6lhyOZXn+VS7wNko=
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