chore: initial public snapshot for github upload

llm-gateway-competitors/sub2api-tar/backend/migrations/044_add_user_totp.sql

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+-- 为 users 表添加 TOTP 双因素认证字段
+ALTER TABLE users
+  ADD COLUMN IF NOT EXISTS totp_secret_encrypted TEXT DEFAULT NULL,
+  ADD COLUMN IF NOT EXISTS totp_enabled BOOLEAN NOT NULL DEFAULT FALSE,
+  ADD COLUMN IF NOT EXISTS totp_enabled_at TIMESTAMPTZ DEFAULT NULL;
+
+COMMENT ON COLUMN users.totp_secret_encrypted IS 'AES-256-GCM 加密的 TOTP 密钥';
+COMMENT ON COLUMN users.totp_enabled IS '是否启用 TOTP 双因素认证';
+COMMENT ON COLUMN users.totp_enabled_at IS 'TOTP 启用时间';
+
+-- 创建索引以支持快速查询启用 2FA 的用户
+CREATE INDEX IF NOT EXISTS idx_users_totp_enabled ON users(totp_enabled) WHERE deleted_at IS NULL AND totp_enabled = true;