feat(sora): 对齐 Sora OAuth 流程并隔离网关请求路径

- 新增并接通 Sora 专用 OAuth 接口与 ST/RT 换取能力
- 完成前端 Sora 授权、RT/ST 手动导入与账号创建流程
- 强化 Sora token 恢复、转发日志与网关路由隔离行为
- 补充后端服务层与路由层相关测试覆盖

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

frontend/src/i18n/locales/en.ts

@@ -1740,9 +1740,13 @@ export default {
           refreshTokenAuth: 'Manual RT Input',
           refreshTokenDesc: 'Enter your existing OpenAI Refresh Token(s). Supports batch input (one per line). The system will automatically validate and create accounts.',
           refreshTokenPlaceholder: 'Paste your OpenAI Refresh Token...\nSupports multiple, one per line',
+          sessionTokenAuth: 'Manual ST Input',
+          sessionTokenDesc: 'Enter your existing Sora Session Token(s). Supports batch input (one per line). The system will automatically validate and create accounts.',
+          sessionTokenPlaceholder: 'Paste your Sora Session Token...\nSupports multiple, one per line',
           validating: 'Validating...',
           validateAndCreate: 'Validate & Create Account',
-          pleaseEnterRefreshToken: 'Please enter Refresh Token'
+          pleaseEnterRefreshToken: 'Please enter Refresh Token',
+          pleaseEnterSessionToken: 'Please enter Session Token'
         },
         // Gemini specific
 	        gemini: {
@@ -1963,6 +1967,7 @@ export default {
       reAuthorizeAccount: 'Re-Authorize Account',
       claudeCodeAccount: 'Claude Code Account',
       openaiAccount: 'OpenAI Account',
+      soraAccount: 'Sora Account',
       geminiAccount: 'Gemini Account',
       antigravityAccount: 'Antigravity Account',
       inputMethod: 'Input Method',

frontend/src/i18n/locales/zh.ts

@@ -1879,9 +1879,13 @@ export default {
           refreshTokenAuth: '手动输入 RT',
           refreshTokenDesc: '输入您已有的 OpenAI Refresh Token，支持批量输入（每行一个），系统将自动验证并创建账号。',
           refreshTokenPlaceholder: '粘贴您的 OpenAI Refresh Token...\n支持多个，每行一个',
+          sessionTokenAuth: '手动输入 ST',
+          sessionTokenDesc: '输入您已有的 Sora Session Token，支持批量输入（每行一个），系统将自动验证并创建账号。',
+          sessionTokenPlaceholder: '粘贴您的 Sora Session Token...\n支持多个，每行一个',
           validating: '验证中...',
           validateAndCreate: '验证并创建账号',
-          pleaseEnterRefreshToken: '请输入 Refresh Token'
+          pleaseEnterRefreshToken: '请输入 Refresh Token',
+          pleaseEnterSessionToken: '请输入 Session Token'
         },
         // Gemini specific
         gemini: {
@@ -2097,6 +2101,7 @@ export default {
       reAuthorizeAccount: '重新授权账号',
       claudeCodeAccount: 'Claude Code 账号',
       openaiAccount: 'OpenAI 账号',
+      soraAccount: 'Sora 账号',
       geminiAccount: 'Gemini 账号',
       antigravityAccount: 'Antigravity 账号',
       inputMethod: '输入方式',