feat: 算力引擎 Go 后端核心（new-api）

- 统一 OpenAI 兼容 /v1 中继 + 渠道/额度/令牌/流水 - 各领域包：relay 模型网关、model 数据层、controller 管理 API
2026-08-23 22:38:46 +08:00
commit 28e53d90fc
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+package claude
+
+import "errors"
+
+// ErrMissingMaxTokens is returned when an OpenAI-format request carries no
+// usable max_tokens and no Options.Claude.DefaultMaxTokens hook is
+// configured. The Claude Messages API rejects requests without max_tokens
+// (400 "max_tokens: Field required"), so conversion fails loudly instead of
+// emitting a request the upstream is guaranteed to refuse.
+var ErrMissingMaxTokens = errors.New("claude messages request requires max_tokens: set max_tokens on the request or configure Options.Claude.DefaultMaxTokens")