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fix: resolve refresh token race condition causing false invalid_grant errors fix issue#1381

do not normalize model for openai API token based accounts

上游API近期更新后，response.completed终态SSE事件的output字段可能为空，
实际内容仅通过response.output_text.delta等增量事件下发。流式路径不受影响，
但chat_completions非流式路径和responses OAuth非流式路径只依赖终态事件的
output，导致返回空响应。

新增BufferedResponseAccumulator累积器，在SSE扫描过程中收集delta事件内容
（文本、function_call、reasoning），当终态output为空时补充重建。

同时修复handleChatBufferedStreamingResponse遗漏response.done事件类型的问题。

Anthropic近期引入基于system参数内容的第三方应用检测机制，原有的前置追加
Claude Code提示词策略无法通过检测（后续内容仍为非Claude Code格式触发429）。

新策略：对非Claude Code客户端的OAuth/SetupToken账号请求，将system字段
完整替换为Claude Code标识提示词，原始system内容作为user/assistant消息对
注入messages开头，模型仍接收完整指令。

仅影响/v1/messages路径，chat_completions和responses路径保持原有逻辑不变。
真正的Claude Code客户端请求完全不受影响（原样透传）。

fix(openai): fail over passthrough 429 and 529

解决账号管理中“正常”筛选包含限流中账号

解决issue#1453提到的反重力不可用问题

The previous Sora removal missed several frontend references, causing
TypeScript build errors for sora_client_enabled and a missing SoraView.vue
import. Clean up all remaining Sora code from types, router, sidebar,
settings, store, and accounts API.

fix(channel): remove cross-platform pricing/mapping leakage for antigravity groups

revert: completely remove Sora platform

Antigravity groups were incorrectly matching pricing and model mapping
entries from anthropic/gemini platform tabs. Each platform should be
strictly isolated — antigravity groups only use antigravity-tagged pricing.

Restore gateway_service.go, setting_handler.go, routes/admin.go,
dto/settings.go, group_repo.go, api_key_repo.go, wire_gen.go to
upstream/main versions and surgically remove only Sora references.

This preserves upstream-only features (RequireOauthOnly, RequirePrivacySet,
GroupResolution, etc.) that were missing when using release branch versions.

When a channel has no model mapping for the requested model, ChannelMappedModel
equals OriginalModel (the user's arbitrary input). Combined with the default
BillingModelSource="channel_mapped", this incorrectly overrides the BillingModel
set by the OpenAI format conversion layer (e.g., gpt-5.4 from DefaultMappedModel)
back to the unmapped original model (e.g., glm) which has no pricing — resulting
in zero-cost billing.

Add guard condition so the channel_mapped override only fires when the channel
actually changed the model (ChannelMappedModel != OriginalModel).

This component is used by SettingsView.vue for backup/data management.
It was mistakenly deleted as "Sora storage management" but contains
non-Sora backup functionality from upstream.

- Remove media_type column from all INSERT/SELECT/SCAN in usage_log_repo
- Remove media_type mock arg from request_type and integration tests
- Adjust scan stub value arrays from 47 to 46 elements

- gofmt: user.go, config_test.go, group_handler.go, smart_retry_test.go
- Remove unused: mergeGroupIDs, resolveProxyURL, "time" import
- Fix api_contract_test.go: remove extra Sora args from NewAdminService,
  NewSettingHandler, NewAccountHandler; remove Sora field expectations
- Fix account_test_service_openai_test.go: restore test helpers

- Run gofmt on user schema, config test, group handler
- Remove unused mergeGroupIDs function
- Restore shared test helpers (newJSONResponse, queuedHTTPUpstream)
  that were in deleted Sora test file

The options parameter only served to switch between 'openai' and 'sora'
platforms. With Sora removed, the parameter is unnecessary.

- Remove unused accessTokenInput ref from OAuthAuthorizationFlow
- Remove unused parsedSessionToken* computed and handleValidateSessionToken
- Prefix unused options parameter in useOpenAIOAuth

- Remove handleImportAccessToken event binding from CreateAccountModal
- Remove unused imports/variables from OAuthAuthorizationFlow (useAppStore,
  parsedAccessToken*, handleImportAccessToken)
- Remove unused oauthPlatform variable from useOpenAIOAuth composable