feat(admin): 完善审计访问上下文与后台布局

backend/alembic/versions/20260709_01_add_audit_access_context.py

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+"""add access context to audit logs
+
+Revision ID: 20260709_01
+Revises: 20260630_02
+Create Date: 2026-07-09 10:00:00.000000
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+
+revision: str = "20260709_01"
+down_revision: Union[str, None] = "20260630_02"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column("audit_logs", sa.Column("client_ip", sa.String(45), nullable=True))
+    op.add_column("audit_logs", sa.Column("user_agent", sa.String(500), nullable=True))
+    op.add_column("audit_logs", sa.Column("client_type", sa.String(16), nullable=True))
+    op.add_column("audit_logs", sa.Column("client_version", sa.String(32), nullable=True))
+    op.add_column("audit_logs", sa.Column("client_platform", sa.String(16), nullable=True))
+    op.add_column("audit_logs", sa.Column("build_channel", sa.String(16), nullable=True))
+    op.add_column("audit_logs", sa.Column("build_commit", sa.String(64), nullable=True))
+    op.create_index("ix_audit_logs_operator_created", "audit_logs", ["operator_id", "created_at"])
+    op.create_index("ix_audit_logs_client_ip_created", "audit_logs", ["client_ip", "created_at"])
+    op.create_index("ix_audit_logs_client_source_created", "audit_logs", ["client_type", "created_at"])
+
+
+def downgrade() -> None:
+    op.drop_index("ix_audit_logs_client_source_created", table_name="audit_logs")
+    op.drop_index("ix_audit_logs_client_ip_created", table_name="audit_logs")
+    op.drop_index("ix_audit_logs_operator_created", table_name="audit_logs")
+    for column in (
+        "build_commit",
+        "build_channel",
+        "client_platform",
+        "client_version",
+        "client_type",
+        "user_agent",
+        "client_ip",
+    ):
+        op.drop_column("audit_logs", column)