Sub2API v1.0 - AI API 网关（二开初始版本，基于上游 Wei-Shaw/sub2api）

backend/migrations/046_add_sora_accounts.sql

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+-- Migration: 046_add_sora_accounts
+-- 新增 sora_accounts 扩展表，存储 Sora 账号的 OAuth 凭证
+-- 与 accounts 主表形成双表结构：
+--   - accounts: 统一账号管理和调度
+--   - sora_accounts: Sora gateway 快速读取和资格校验
+--
+-- 设计说明：
+--   - account_id 为主键，外键关联 accounts.id
+--   - ON DELETE CASCADE 确保删除账号时自动清理扩展表
+--   - access_token/refresh_token 与 accounts.credentials 保持同步
+
+CREATE TABLE IF NOT EXISTS sora_accounts (
+    account_id BIGINT PRIMARY KEY,
+    access_token TEXT NOT NULL,
+    refresh_token TEXT NOT NULL,
+    session_token TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    CONSTRAINT fk_sora_accounts_account_id
+        FOREIGN KEY (account_id) REFERENCES accounts(id)
+        ON DELETE CASCADE
+);
+
+-- 索引说明：主键已自动创建唯一索引，无需额外创建 idx_sora_accounts_account_id