feat(rvw): Complete Phase 4-5 - Bug fixes and Word export

Summary:
- Fix methodology score display issue in task list (show score instead of 'warn')
- Add methodology_score field to database schema
- Fix report display when only methodology agent is selected
- Implement Word document export using docx library
- Update documentation to v3.0/v3.1

Backend changes:
- Add methodologyScore to Prisma schema and TaskSummary type
- Update reviewWorker to save methodologyScore
- Update getTaskList to return methodologyScore

Frontend changes:
- Install docx and file-saver libraries
- Implement handleExportReport with Word generation
- Fix activeTab auto-selection based on available data
- Add proper imports for docx components

Documentation:
- Update RVW module status to 90% (Phase 1-5 complete)
- Update system status document to v3.0

Tested: All review workflows verified, Word export functional

frontend-v2/src/modules/rvw/components/BatchToolbar.tsx

@@ -0,0 +1,43 @@
+/**
+ * 批量操作浮动工具栏
+ */
+import { Play, X } from 'lucide-react';
+
+interface BatchToolbarProps {
+  selectedCount: number;
+  onRunBatch: () => void;
+  onClearSelection: () => void;
+}
+
+export default function BatchToolbar({ selectedCount, onRunBatch, onClearSelection }: BatchToolbarProps) {
+  if (selectedCount === 0) return null;
+
+  return (
+    <div className="fixed bottom-8 left-1/2 transform -translate-x-1/2 bg-slate-800 text-white px-5 py-3 rounded-full shadow-2xl flex items-center gap-6 z-30 fade-in border border-slate-700">
+      <div className="flex items-center gap-2">
+        <div className="w-5 h-5 rounded-full bg-indigo-500 flex items-center justify-center text-[10px] font-bold">
+          {selectedCount}
+        </div>
+        <span className="text-sm font-medium">个文件已选中</span>
+      </div>
+      
+      <div className="h-4 w-px bg-slate-600" />
+      
+      <button 
+        onClick={onRunBatch}
+        className="text-sm font-bold text-white hover:text-indigo-300 flex items-center gap-2 transition-colors"
+      >
+        <Play className="w-4 h-4 text-green-400" />
+        运行智能审稿
+      </button>
+      
+      <button 
+        onClick={onClearSelection}
+        className="text-slate-400 hover:text-white ml-2"
+      >
+        <X className="w-4 h-4" />
+      </button>
+    </div>
+  );
+}
+