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fix(openai): convert string input to array for Codex OAuth responses endpoint (fix #919)

The ChatGPT backend-api codex/responses endpoint requires `input` to be
an array, but the OpenAI Responses API spec allows it to be a plain string.
When a client sends a string input, sub2api now converts it to the expected
message array format. Empty/whitespace-only strings become an empty array
to avoid triggering a 400 "Input must be a list" error.

feat: 允许管理员为持有有效订阅的用户绑定订阅类型分组

 fix: Linux.do OAuth 注册支持邀请码两步流程 (fix #836)

feat: cleanup stale concurrency slots on startup

fix: OpenAI临时性400错误支持池模式同账号重试 & HelpTooltip层级修复

fix: use shared max_line_size config for OpenAI Responses SSE scanner

fix(frontend): stack quota badges vertically in capacity column

feat(frontend): pass locale to iframe embedded pages via lang parameter

feat: OpenAI 账号信息增强 & 批量操作支持

1. 识别OpenAI "An error occurred while processing your request" 临时性400错误
   并触发failover，同时在池模式下标记RetryableOnSameAccount，允许同账号重试
2. ForwardAsAnthropic路径同步支持临时性400错误的识别和同账号重试
3. HelpTooltip组件使用Teleport渲染到body，修复在dialog内被裁切的问题

Two SSE scanners in openai_gateway_messages.go were hardcoded to 1MB
while all other scanners use defaultMaxLineSize (500MB) with config
override. This caused Responses API streams to fail on large payloads.

之前管理员无法通过 API 密钥管理将用户绑定到订阅类型分组（直接返回错误）。
现在改为检查用户是否持有该分组的有效订阅，有则允许绑定，无则拒绝。

- admin_service: 新增 userSubRepo 依赖，替换硬拒绝为订阅校验
- admin_service: 区分 ErrSubscriptionNotFound 和内部错误，避免 DB 故障被误报
- wire_gen/api_contract_test: 同步新增参数
- UserApiKeysModal: 管理员分组下拉不再过滤订阅类型分组
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- 提取 refreshSingleAccount 私有方法复用单账号刷新逻辑
- 新增 BatchClearError handler (POST /admin/accounts/batch-clear-error)
- 新增 BatchRefresh handler (POST /admin/accounts/batch-refresh)
- 前端 AccountBulkActionsBar 添加批量重置状态/刷新令牌按钮
- AccountsView 添加 handler 支持 partial success 反馈
- i18n 中英文补充批量操作相关翻译

提取 DecodeIDToken（跳过过期校验）供导入场景使用，
ParseIDToken 复用它并保留原有过期检查行为。
导入 OpenAI/Sora OAuth 账号时自动补充缺失的 email、
plan_type、chatgpt_account_id 等字段，不覆盖已有值。

OAuth 授权和 token 刷新时从 id_token 的 OpenAI auth claim 中
提取 chatgpt_plan_type（plus/team/pro/free），存入 credentials，
账号管理页面 PlatformTypeBadge 显示订阅类型。

QuotaBadge components (daily/weekly/total) were wrapped in a
horizontal flex container, making them visually inconsistent with
other capacity badges (concurrency, window cost, sessions, RPM)
which stack vertically. Remove the wrapper so all badges align
consistently.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

When the service restarts, concurrency slots from the old process
remain in Redis, causing phantom occupancy. On startup, scan all
concurrency sorted sets and remove members with non-current process
prefix, then clear orphaned wait queue counters.

Uses Go-side SCAN to discover keys (compatible with Redis client
prefix hooks in tests), then passes them to a Lua script for
atomic member-level cleanup.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Embedded pages (purchase subscription, custom pages) now receive the
current user locale through a `lang` URL parameter, allowing iframe
content to match the user's language preference.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

fix(billing): 修复 OpenAI fast 档位计费并补齐展示

- 打通 service_tier 在 OpenAI HTTP、WS、passthrough 与 usage 记录中的传递
- 修正 priority/flex 计费逻辑，并将 fast 归一化为 priority
- 在用户端和管理端补齐服务档位与计费明细展示
- 补齐前后端测试，并修复 WS 限流信号重复持久化导致的全量回归失败
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

fix(openai): remove misplaced passthrough check from isModelSupportedByAccount

feat(frontend): 为后台账号管理和 IP 管理增加拖筐选中能力

fix: increase SSE scanner max line size from 40MB to 500MB

chore: bump Antigravity user agent version to 1.20.4

[Fix] Fix issue #851 

The viper config default (config.go) was overriding the constant
in gateway_service.go. Both must be updated to take effect.