feat(auth): 强制要求 username 并- 添加 hooks 验证 username 必填

- 修改 schema: username 改为 NOT NULL
- 重置本地和生产数据库

prisma/schema.prisma

@@ -16,7 +16,7 @@ model User {
   createdAt            DateTime             @default(now())
   updatedAt            DateTime             @updatedAt
   displayUsername      String?
-  username             String?              @unique
+  username             String               @unique
   accounts             Account[]
   dictionaryLookUps    DictionaryLookUp[]
   folders              Folder[]