refactor(core): 抽出共享 ProductCreateDrawer · 商品/项目新建复用同一流程

- 新增 components/product-create-drawer.tsx,products/projects 改用同一右侧 Drawer 组件(products -188 / projects -116)
- ai-tools 配套调整;附 perf-report 产物

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

core/frontend/src/ai-tools-page.css

@@ -311,6 +311,8 @@
   width: 36px; height: 36px;
   border-radius: var(--r-sm);
 }
+.image-workbench .iw-prod-item .thumb.has-real-media { overflow: hidden; background: var(--background-lighter); }
+.image-workbench .iw-prod-item .thumb.has-real-media img { width: 100%; height: 100%; object-fit: cover; display: block; }
 .image-workbench .iw-prod-item .body { flex: 1; min-width: 0; }
 .image-workbench .iw-prod-item .nm {
   font-size: 13px; color: var(--accent-black); font-weight: 500;