phsl / new-api

refactor: 抽象统一计费会话 BillingSession

✨ refactor(wallet): Top-up layout to embed subscription plans into the recharge card tabs

- Defaulting to subscriptions when available and avoiding initial flash when no plans exist.
- Adjust the wide-screen layout to place wallet and invite sections side by side, simplify the subscription header and controls, and add padding to prevent card borders from clipping.
- Update related i18n strings by adding the new tab label and removing the obsolete subscription blurb.

- Settle 部分失败保护：新增 fundingSettled 标记，资金来源提交后
  令牌调整失败不再导致 Refund 误退已结算的资金
- 订阅多扣费修复：trySubscription 传 subConsume 而非 preConsumedQuota
  给 preConsume，保证三者（amount/preConsume/FinalPreConsumedQuota）一致
- 令牌回滚错误记录：preConsume 中 funding 失败时令牌回滚错误不再丢弃
- 移除钱包路径死代码：用户额度不足的 strings.Contains 匹配不可能命中
- WalletFunding.Refund 不重试：IncreaseUserQuota 非幂等，重试会多退

将散落在多个文件中的预扣费/结算/退款逻辑抽象为统一的 BillingSession 生命周期管理：

- 新增 BillingSettler 接口 (relay/common/billing.go) 避免循环引用
- 新增 FundingSource 接口 + WalletFunding / SubscriptionFunding 实现 (service/funding_source.go)
- 新增 BillingSession 封装预扣/结算/退款原子操作 (service/billing_session.go)
- 新增 SettleBilling 统一结算辅助函数，替换各 handler 中的 quotaDelta 模式
- 重写 PreConsumeBilling 为 BillingSession 工厂入口
- controller/relay.go 退款守卫改用 BillingSession.Refund()

修复的 Bug：
- 令牌额度泄漏：PreConsumeTokenQuota 成功但 DecreaseUserQuota 失败时未回滚
- 订阅退款遗漏：FinalPreConsumedQuota=0 但 SubscriptionPreConsumed>0 时跳过退款
- 订阅多扣费：subConsume 强制为 1 但 FinalPreConsumedQuota 不同步
- 退款路径不统一：钱包/订阅退款逻辑现统一由 FundingSource.Refund 分派

fix: /v1/chat/completions -> /v1/responses json_schema

- Change ESCAPE character from '\' to '!' for compatibility with MySQL/PostgreSQL/SQLite
- Adjust sanitization logic to escape '!' and '_' correctly, improving input validation for search queries

fix: harden token search with pagination, rate limiting and input validation

- Add configurable per-user token creation limit (max_user_tokens)
- Sanitize search input patterns to prevent expensive queries
- Add per-user search rate limiting (by user ID)
- Add pagination to search endpoint with strict page size cap
- Skip empty search fields instead of matching nothing
- Hide internal errors from API responses
- Fix Interface2String float64 formatting causing config parse failures
- Add float-string fallback in config system for int/uint fields

feat: add claude-opus-4-6

🔒 fix(security): sanitize AI-generated HTML to prevent XSS in playground

Mitigate XSS vulnerabilities in the playground where AI-generated content
is rendered without sanitization, allowing potential script injection via
prompt injection attacks.

MarkdownRenderer.jsx:
- Replace dangerouslySetInnerHTML with a sandboxed iframe for HTML preview
- Use sandbox="allow-same-origin" to block script execution while allowing
  CSS rendering and iframe height auto-sizing
- Add SandboxedHtmlPreview component with automatic height adjustment

CodeViewer.jsx:
- Add escapeHtml() utility to encode HTML entities before rendering
- Rewrite highlightJson() to process tokens iteratively, escaping each
  token and structural text before wrapping in syntax highlighting spans
- Escape non-JSON and very-large content paths that previously bypassed
  sanitization
- Update linkRegex to correctly match URLs containing & entities

These changes only affect the playground (AI output rendering). Admin-
configured content (home page, about page, footer, notices) remains
unaffected as they use separate code paths and are within the trusted
admin boundary.

Update .gitattributes to enhance text file handling and mark additional file types for LF normalization and binary detection

- Add support for custom OAuth providers, including creation, retrieval, updating, and deletion.
- Introduce new model and controller for managing custom OAuth providers.
- Enhance existing OAuth logic to accommodate custom providers.
- Update API routes for custom OAuth provider management.
- Include i18n support for custom OAuth-related messages.

- Introduce Provider interface pattern for standard OAuth protocols
- Create unified controller/oauth.go with common OAuth logic
- Add OAuthError type for translatable error messages
- Add i18n keys and translations (zh/en) for OAuth messages
- Use common.ApiErrorI18n/ApiSuccessI18n for consistent responses
- Preserve backward compatibility for existing routes and data

remove: drop support for claude-2 and claude-1 series models

- Remove claude-instant-1.2, claude-2, claude-2.0, claude-2.1 from model lists
- Remove /v1/complete endpoint support (legacy completion API)
- Remove RequestModeCompletion and related code paths
- Simplify handler functions by removing requestMode parameter
- Update all channel adaptors that referenced claude handlers

fix: charge local input tokens when Gemini returns empty response

fix: optimize Codex relay

feat: backend i18n

feat: 支持基于Go Regex规则和全量的请求体透传

fix: map Responses reasoning stream to chat completion deltas

🐛 fix: sidebar scroll on mobile dynamic viewport

✨ fix: Improve subscription payment handling and card layout consistency