中文：收口权限与中心/立项配置改造

backend/alembic/versions/20260512_01_add_phone_to_sites.py

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+"""add phone to sites
+
+Revision ID: 20260512_01
+Revises: 20260511_02
+Create Date: 2026-05-12 09:30:00.000000
+
+"""
+
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = "20260512_01"
+down_revision: Union[str, None] = "20260511_02"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    bind = op.get_bind()
+    inspector = sa.inspect(bind)
+    columns = {col["name"] for col in inspector.get_columns("sites")}
+
+    if "phone" not in columns:
+        op.add_column("sites", sa.Column("phone", sa.String(length=100), nullable=True))
+
+
+def downgrade() -> None:
+    bind = op.get_bind()
+    inspector = sa.inspect(bind)
+    columns = {col["name"] for col in inspector.get_columns("sites")}
+
+    if "phone" in columns:
+        op.drop_column("sites", "phone")