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golangci-lint v2.7 was built with Go 1.25 and cannot lint Go 1.26
targets. v2.8+ added Go 1.26 support.

Fix/empty streamfix issue #791 

fix(ccswitch): improve import provider name and usage parsing

fix(account): preserve existing credentials when saving apikey accounts

GO-2026-4602 (os), GO-2026-4601 (net/url), GO-2026-4600 and
GO-2026-4599 (crypto/x509). The crypto/x509 fixes are only
available in go1.26.1+, not backported to go1.25.x.

对齐/v1/responses的Forward方法，修复两处不一致：
- 成功响应时从响应头提取OAuth账号的Codex使用量数据
- 非failover错误场景下应用管理员配置的错误透传规则

fix(usage): 修复用量查询 429 重试风暴，增加负缓存、请求去重与随机延迟

- Fix gofmt: align struct field comments in UsageCache, trim trailing
  whitespace on const comments
- Fix errcheck: use comma-ok on type assertion for singleflight result
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Prevents 429 rate-limit retry storms and reduces upstream correlation risk
for Anthropic usage API queries.

Three changes:
1. Negative caching (1 min TTL) — 429/error responses are now cached,
   preventing every subsequent page load from re-triggering failed API calls.
2. singleflight dedup — concurrent requests for the same account are
   collapsed into a single upstream call, preventing cache stampede.
3. Random jitter (0–800 ms) — staggers multi-account cache-miss bursts so
   requests from different accounts don't hit upstream simultaneously with
   identical TLS fingerprints, reducing anti-abuse correlation risk.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

When customErrorCodes is disabled or modelMapping is empty, explicitly
delete the fields inherited from currentCredentials spread to avoid
preserving stale values.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

fix: Setup Token 账号使用真实 utilization 值替代状态估算

fix(openai): 修复 WS 模式下用量窗口不显示

从响应头 anthropic-ratelimit-unified-5h-utilization 获取并存储真实
utilization 值，解决进度条始终显示 0% 的问题。窗口重置时清除旧值，
避免残留上个窗口的数据。
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

When editing an apikey account, the credentials object was built from
scratch, causing fields like tier_id that are not exposed in the UI to
be silently dropped on save. Spread currentCredentials first so unknown
fields are retained, then let the known fields overwrite them.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

feat(openai): 添加 /v1/messages 端点和 API 兼容层

fix(openai): support remote compact task

fix(openai): 统一专属倍率计费链路并补齐回归测试

fix: 修复账号列表五小时用量显示为 $0.00 的问题

移除订阅扣费 stub 中未被使用的状态字段与赋值，
消除 golangci-lint 的 unused 告警，保持回归测试语义不变。
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

抽取共享的用户分组专属倍率解析器，统一缓存、singleflight 与回退逻辑。\n\n让 OpenAI 独立计费链路复用专属倍率解析，修复 usage 记录与实际扣费未命中用户专属倍率的问题。\n\n补齐 OpenAI 计费与解析器单元测试，并修复全量回归中暴露的 lint 阻塞项。\n\nCo-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

commit 80ae592c 引入 lite 模式优化首次加载性能，但将窗口费用查询也一起跳过了。
commit 491a7444

 尝试用 30 秒快照缓存修复，但缓存过期后问题复现。

移除窗口费用查询的 lite/非 lite 区分，始终执行 PostgreSQL 聚合查询。
同时删除不再需要的 account_window_cost_cache.go 文件。
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

在 admin.proxies 下添加 protocols 对象的中文翻译，
与 en.ts 保持一致。
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Add recoverAnthropicMessagesPanic for Messages handler to return
  Anthropic-formatted errors instead of OpenAI Responses format on panic
- Add nil check for rateLimitService.HandleUpstreamError in
  ForwardAsAnthropic to match defensive pattern used elsewhere
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Add Anthropic Messages API support for OpenAI platform groups, enabling
clients using Claude-style /v1/messages format to access OpenAI accounts
through automatic protocol conversion.

- Add apicompat package with type definitions and bidirectional converters
  (Anthropic ↔ Chat, Chat ↔ Responses, Anthropic ↔

 Responses)
- Implement /v1/messages endpoint for OpenAI gateway with streaming support
- Add model mapping UI for OpenAI OAuth accounts (whitelist + mapping modes)
- Support prompt caching fields and codex OAuth transforms
- Fix tool call ID conversion for Responses API (fc_ prefix)
- Ensure function_call_output has non-empty output field
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

fix(openai): passthrough accounts bypass model mapping check

透传模式账号仅替换认证，应允许所有模型通过。之前调度阶段的
isModelSupportedByAccount 不感知透传模式，导致 model_mapping
中未配置的新模型（如 gpt-5.4）被拒绝返回 503。