feat(mcp): подготовить сервер и доступ к приёмке

backend/drizzle/0017_mcp_controller.sql

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+BEGIN;
+ALTER TABLE mcp_routing_profiles ADD COLUMN IF NOT EXISTS credential_id uuid REFERENCES mcp_credentials(id);
+ALTER TABLE mcp_routing_profiles ADD COLUMN IF NOT EXISTS generation text;
+ALTER TABLE mcp_routing_profiles ADD COLUMN IF NOT EXISTS policy_version integer;
+CREATE INDEX IF NOT EXISTS mcp_routing_profiles_enabled ON mcp_routing_profiles(updated_at) WHERE enabled;
+CREATE UNIQUE INDEX IF NOT EXISTS mcp_drift_open_step ON mcp_drift(operation_id,(expected->>'stepIndex')) WHERE acknowledged_at IS NULL;
+COMMIT;