feat(mcp): подготовить сервер и доступ к приёмке

backend/drizzle/0021_mcp_path_checks.sql

@@ -0,0 +1,8 @@
+BEGIN;
+CREATE TABLE IF NOT EXISTS mcp_path_checks (
+ id uuid PRIMARY KEY, connection_id uuid NOT NULL REFERENCES mcp_connections(id),
+ profile_hash text NOT NULL, candidate_id text NOT NULL, status text NOT NULL CHECK(status IN ('passed','failed','unknown')),
+ evidence jsonb NOT NULL, created_at timestamptz NOT NULL DEFAULT now()
+);
+CREATE INDEX IF NOT EXISTS mcp_path_checks_latest ON mcp_path_checks(connection_id,profile_hash,candidate_id,created_at DESC);
+COMMIT;