add google oauth login

prisma/migrations/20260706090000_add_user_oauth_accounts/migration.sql

@@ -0,0 +1,28 @@
+CREATE TABLE "user_oauth_accounts" (
+  "id" UUID NOT NULL DEFAULT gen_random_uuid(),
+  "user_id" UUID NOT NULL,
+  "provider" TEXT NOT NULL,
+  "provider_user_id" TEXT NOT NULL,
+  "email" TEXT,
+  "created_at" TIMESTAMPTZ(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  "updated_at" TIMESTAMPTZ(3) NOT NULL,
+  CONSTRAINT "user_oauth_accounts_pkey" PRIMARY KEY ("id")
+);
+
+CREATE UNIQUE INDEX "user_oauth_accounts_provider_provider_user_id_key"
+  ON "user_oauth_accounts"("provider", "provider_user_id");
+
+CREATE INDEX "user_oauth_accounts_user_id_idx" ON "user_oauth_accounts"("user_id");
+
+ALTER TABLE "user_oauth_accounts"
+  ADD CONSTRAINT "user_oauth_accounts_user_id_fkey"
+  FOREIGN KEY ("user_id") REFERENCES "users"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+COMMENT ON TABLE "user_oauth_accounts" IS '중앙 사용자와 외부 OAuth 제공자 계정을 매핑한다';
+COMMENT ON COLUMN "user_oauth_accounts"."id" IS 'OAuth 계정 매핑 고유 ID';
+COMMENT ON COLUMN "user_oauth_accounts"."user_id" IS '연결된 중앙 사용자 ID';
+COMMENT ON COLUMN "user_oauth_accounts"."provider" IS 'OAuth 제공자 코드. 예: google';
+COMMENT ON COLUMN "user_oauth_accounts"."provider_user_id" IS 'OAuth 제공자가 발급한 사용자 고유 ID';
+COMMENT ON COLUMN "user_oauth_accounts"."email" IS 'OAuth 제공자에서 받은 이메일';
+COMMENT ON COLUMN "user_oauth_accounts"."created_at" IS '매핑 생성 시각';
+COMMENT ON COLUMN "user_oauth_accounts"."updated_at" IS '매핑 수정 시각';