fix: scale web-probe tail scan budget (#786)

Co-authored-by: Codex <codex@noreply.local>

scripts/src/hwlab-node-web-observe-runner-source.ts

@@ -2480,7 +2480,7 @@ async function readTailLines(file, limit) {
   const info = await stat(file);
   if (!info.size || limit <= 0) return [];
   const chunkSize = 64 * 1024;
-  const maxBytes = 32 * 1024 * 1024;
+  const maxBytes = Math.max(32 * 1024 * 1024, Math.min(256 * 1024 * 1024, limit * 512 * 1024));
   const chunks = [];
   let position = info.size;
   let readBytes = 0;