fix: 添加数据库迁移补齐 User API Key 字段

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

prisma/migrations/20260403170000_user_api_key_fields/migration.sql

@@ -0,0 +1,7 @@
+-- AlterTable: Add API key fields to User
+ALTER TABLE "User" ADD COLUMN "apiKeyHash" TEXT;
+ALTER TABLE "User" ADD COLUMN "apiKeyEncrypted" TEXT;
+ALTER TABLE "User" ADD COLUMN "apiKeyPrefix" TEXT;
+
+-- AlterTable: Remove apiKeyHash from Project (moved to User)
+ALTER TABLE "Project" DROP COLUMN "apiKeyHash";