feat: add secure batch completion reports

Generate immutable post-cleanup summaries only after queue, history, and recovery finalization. Add bilingual accessible report UI, host and cleanup metrics, report-bound JSON and sanitized error CSV exports, renderer reload recovery, duplicate-filename-safe accounting, and public-source verification coverage.

lib/upload-manager.js

@@ -441,7 +441,7 @@ class UploadManager extends EventEmitter {
       for (let j = i; j < end; j++) {
         const task = tasks[j];
         if (!results.has(task.file)) {
-          results.set(task.file, { name: path.basename(task.file), size: 0, results: [] });
+          results.set(task.file, { name: path.basename(task.file), fileKey: task.fileKey || null, size: 0, results: [] });
           toStat.push(task.file);
         }
       }
@@ -1863,7 +1863,7 @@ class UploadManager extends EventEmitter {
       if (!results.has(task.file)) {
         let size = 0;
         try { size = fs.statSync(task.file).size; } catch {}
-        results.set(task.file, { name: fileName, size, results: [] });
+        results.set(task.file, { name: fileName, fileKey: task.fileKey || null, size, results: [] });
       }
       this._batchTotal++;
       this._additionalPromises.push(this._runJob(task, results, signal));