fix: 修两个 bug

1. ArticleRead.user_id 改 Integer(users.id 是 Integer,不是 BigInteger)
   alembic 0007 同样改 Integer
2. ArticleDetail.vue toggleRead 重复 catch 块导致 build 失败
   (edit 时新加的 catch 跟 toggleStar 残留的 catch 撞了)

backend/alembic/versions/0007_article_reads.py

@@ -25,8 +25,8 @@ depends_on = None
 def upgrade() -> None:
     op.create_table(
         "article_reads",
-        sa.Column("user_id", sa.BigInteger, nullable=False),
-        sa.Column("article_id", sa.BigInteger, nullable=False),
+        sa.Column("user_id", sa.Integer, nullable=False),  # users.id 是 Integer
+        sa.Column("article_id", sa.BigInteger, nullable=False),  # articles.id 是 BigInteger
         sa.Column("read_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.text("now()")),
         sa.PrimaryKeyConstraint("user_id", "article_id", name="pk_article_reads"),
         sa.ForeignKeyConstraint(