feat: 项目模块加删除按钮（仅超管 + 无版本可删）

- useProductStore 加 deleteProject(productId, projectId) action
- ProjectRow 行右侧加三点菜单（MoreHorizontal）+ 下拉项「删除项目」
- 项目下有版本时菜单项 disabled + tooltip「项目下还有 N 个版本，不可删除」
- 仅有 project:delete 权限的角色（默认仅超管）能看到三点 icon
- 点击删除 → confirm → 调 deleteProject

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/stores/useProductStore.ts

@@ -79,6 +79,7 @@ interface ProductState {
   createVersion: (productId: string, data: { name: string; status: string }) => void;
   updateVersion: (productId: string, versionId: string, data: Partial<VersionItem>) => void;
   deleteVersion: (productId: string, versionId: string) => void;
+  deleteProject: (productId: string, projectId: string) => void;
 }
 
 export const useProductStore = create<ProductState>((set, get) => ({
@@ -273,6 +274,19 @@ export const useProductStore = create<ProductState>((set, get) => ({
     set({ overview: updated });
     saveLocal(updated);
   },
+
+  deleteProject: (productId, projectId) => {
+    const updated = get().overview.map((p) => {
+      if (p.id !== productId) return p;
+      return {
+        ...p,
+        projects: p.projects.filter((proj) => proj.id !== projectId),
+        _count: { ...p._count, projects: Math.max(0, (p._count?.projects ?? 0) - 1) } as any,
+      };
+    });
+    set({ overview: updated });
+    saveLocal(updated);
+  },
 }));
 
 const STORAGE_KEY = 'ftb_products_overview_v4';