feat: 导入 MemRelay 初始源码

backend/migrations/versions/20260805_0010_token_all_profiles.py

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+"""Add all-profiles MCP token scope.
+
+Revision ID: 20260805_0010
+Revises: 20260804_0009
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "20260805_0010"
+down_revision = "20260804_0009"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    with op.batch_alter_table("mcp_tokens") as batch:
+        batch.add_column(
+            sa.Column("all_profiles", sa.Boolean(), nullable=False, server_default=sa.false())
+        )
+
+
+def downgrade() -> None:
+    with op.batch_alter_table("mcp_tokens") as batch:
+        batch.drop_column("all_profiles")