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根因: select_best_key 遇到解密失败时直接 500 返回, 不会尝试下一个 key。如果 DB 中有旧的加密格式 key, 整个 relay 请求被阻断。 修复: - key_pool: 解密失败时 warn + skip 到下一个 key,不再 500 - key_pool: 新增 heal_provider_keys() 启动自愈迁移 - 逐个尝试解密所有加密 key - 解密成功 → 用当前密钥重新加密(幂等) - 解密失败 → 标记 is_active=false + warn - main.rs: 启动时调用自愈迁移(在 TOTP 迁移之后)