perf(test): silence config overwrite warnings in vitest

src/config/io.ts

@@ -830,6 +830,11 @@ export function createConfigIO(overrides: ConfigIoDeps = {}) {
       if (!snapshot.exists) {
         return;
       }
+      const isVitest = deps.env.VITEST === "true";
+      const shouldLogInVitest = deps.env.OPENCLAW_TEST_CONFIG_OVERWRITE_LOG === "1";
+      if (isVitest && !shouldLogInVitest) {
+        return;
+      }
       const changeSummary =
         typeof changedPathCount === "number" ? `, changedPaths=${changedPathCount}` : "";
       deps.logger.warn(