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Previously, v-model.number produced "" when input was cleared, causing
JSON decode errors on the backend. Also, normalizeLimit treated 0 as
"unlimited" which prevented setting a zero quota. Now "" is converted
to null (unlimited) in frontend, and 0 is preserved as a valid limit.

Closes Wei-Shaw/sub2api#1021

后端默认 alert.enabled=true 但 recipients 为空，前端验证将其视为
错误并阻断保存按钮。移除该阻断性验证，改为保存时自动禁用无收件人
的邮件通知配置。

将独立的 /admin/backup 和 /admin/data-management 页面整合到设置页，
作为「备份」和「Sora 存储」标签页，减少侧边栏条目，集中管理配置。

- 移除 BackupView 和 DataManagementView 的 AppLayout 包装
- 在 SettingsView 中以子组件形式嵌入，使用 v-show 切换标签
- 删除独立路由和侧边栏菜单入口
- 备份/数据标签页下隐藏主保存按钮（各自有独立保存）
- 优化标签栏样式适配7个标签，PC端支持细滚动条
- 清理未使用的图标组件和 i18n 键

fix: handle invalid encrypted content error and retry logic.

fix(ops): tune aggregation constants to prevent PG overload

feat: 数据库定时备份与恢复（S3 兼容存储，支持 Cloudflare R2）

Increase MAX(bucket_start) query timeout from 3s to 5s to reduce
timeout-induced fallbacks. Shrink backfill window from 30 days to
1 hour so that fallback recomputation stays lightweight instead of
scanning the entire retention range.

feat: add Backend Mode toggle to disable user self-service

feat: 账号配额支持固定时间重置模式

1. S3 凭证加密存储：使用 SecretEncryptor (AES-256-GCM) 加密 SecretAccessKey，
   防止备份文件中泄露 S3 凭证，兼容旧的未加密数据
2. 修复 saveRecord 竞态条件：添加 recordsMu 互斥锁保护 records 的 load/save
3. 恢复操作增加服务端验证：handler 层要求重新输入管理员密码，通过 bcrypt
   校验，前端弹出密码输入框
4. pg_dump/psql/S3 操作抽象为接口：定义 DBDumper 和 BackupObjectStore 接口，
   实现放入 repository 层，遵循项目依赖注入架构规范
5. 改为流式处理避免大数据库 OOM：备份时 pg_dump stdout -> gzip -> io.Pipe ->
   S3 upload；恢复时 S3 download -> gzip reader -> psql stdin，不再全量加载
6. loadRecords 区分"无数据"和"数据损坏"场景：JSON 解析失败返回明确错误
7. 添加 18 个核心逻辑单元测试：覆盖加密、并发、流式备份/恢复、错误处理等
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

refactor: merge bedrock-apikey into unified bedrock channel with auth_mode

feat(antigravity): add 403 forbidden status detection and display

feat(ops): make OpenAI token stats optional

Consolidate two separate channel types (bedrock + bedrock-apikey) into
a single "AWS Bedrock" channel. Authentication mode is now distinguished
by credentials.auth_mode ("sigv4" | "apikey") instead of separate types.

Backend:
- Remove AccountTypeBedrockAPIKey constant
- IsBedrock() simplified; IsBedrockAPIKey() checks auth_mode
- Add IsAPIKeyOrBedrock() helper to eliminate repeated type checks
- Extend pool mode, quota scheduling, and billing to bedrock
- Add RetryableOnSameAccount to handleBedrockUpstreamErrors
- Add "bedrock" scope to Beta Policy for independent control

Frontend:
- Merge two buttons into one "AWS Bedrock" with auth mode radio
- Badge displays "Anthropic | AWS"
- Pool mode and quota limit UI available for bedrock
- Quota display in account list (usage bars, capacity badges, reset)
- Remove all bedrock-apikey type references

fix: 止血 Codex/Responses 原生 input id 被误改成 fc_*

fix: chat compatibility model fallback and reasoning_content output

fix: respect OpenAI OAuth model mapping in admin available models

fix: honor account model mapping before group fallback

# Conflicts:
#	backend/internal/service/openai_gateway_service.go

fix: sync scheduler snapshot on account updates

docs: add iframe integration feature and ecosystem projects section

- apply default mapped model only when scheduling fallback is actually used

- preserve reasoning in OpenAI-compatible output via reasoning_content and avoid invalid input function_call ids

sub2api: add bedrock support

The 403 detection PR changed the 401 handler condition from
`account.Type == AccountTypeOAuth` to
`account.Type == AccountTypeOAuth && account.Platform == PlatformOpenAI`,
which accidentally excluded Gemini OAuth from the temp-unschedulable path.

Fix: use `!= PlatformAntigravity` instead, preserving Gemini behavior
while correctly excluding Antigravity (whose 401 is handled by
applyErrorPolicy's temp_unschedulable_rules).

Update tests to reflect Antigravity's new 401 semantics:
- HandleUpstreamError: Antigravity OAuth 401 now uses SetError
- CheckErrorPolicy: Antigravity 401 second hit stays TempUnscheduled
- DB fallback: split into Gemini (escalates) and Antigravity (stays temp)

feat(admin): add user spending ranking dashboard view

fix: remove SSE termination marker from DefaultStopSequences