feat(mcp): подготовить сервер и доступ к приёмке

backend/drizzle/0020_mcp_management.sql

@@ -0,0 +1,8 @@
+BEGIN;
+CREATE TABLE IF NOT EXISTS mcp_management_channels (
+ id uuid PRIMARY KEY, server_id bigint NOT NULL UNIQUE REFERENCES servers(id) ON DELETE CASCADE,
+ config_sealed text NOT NULL, identity_hash text NOT NULL, attestation text NOT NULL,
+ created_by text NOT NULL, generation text NOT NULL, expires_at timestamptz NOT NULL,
+ verified_at timestamptz NOT NULL DEFAULT now(), revoked_at timestamptz
+);
+COMMIT;