feat: 新增合同审查功能 —— AI 条款完整性检查 + 风险评分 + 修改建议

- 后端：contract_review.go —— 检查条款完整性、付款/违约/争议条款、风险评分 0-100、AI 深度审查
- 前端：ContractReviewPage.vue —— 合同输入、风险评分展示、风险详情列表、修改建议
- 路由：POST /api/contract/review + 前端 /tools/contract-review 路由
- 模板：StudioPage 新增合同审查模板入口

Co-Authored-By: Claude Code <noreply@anthropic.com>

eai_ap_app/frontend/src/router/index.js

@@ -23,6 +23,7 @@ const routes = [
       { path: 'apps/knowledge-operations', name: 'KnowledgeOperationsApp', meta: { workspaceKey: 'knowledge-operations' }, component: () => import('@/views/workbench/BusinessAppPage.vue') },
       { path: 'apps/process-coordination', name: 'ProcessCoordinationApp', meta: { workspaceKey: 'process-coordination' }, component: () => import('@/views/workbench/BusinessAppPage.vue') },
       { path: 'apps/report-generation', name: 'ReportGenerationApp', meta: { workspaceKey: 'report-generation' }, component: () => import('@/views/workbench/BusinessAppPage.vue') },
+      { path: 'tools/contract-review', name: 'ContractReview', component: () => import('@/views/tools/ContractReviewPage.vue') },
       { path: 'report-gen', name: 'ReportGeneration', meta: { requiresAdmin: true }, component: () => import('@/views/report/ReportGenerationPage.vue') },
       { path: 'tools/document-translate', name: 'DocumentTranslate', component: () => import('@/views/tools/DocumentTranslatePage.vue) },
       { path: 'tools/copy-proofreading', name: 'CopyProofreading', component: () => import('@/views/tools/CopyProofreadingPage.vue) },