fix(整合): 修复十二项原则布局、格子配色及菜单位置

src/components/layout/Sidebar.tsx

@@ -18,10 +18,10 @@ const navItems = [
   { path: '/', label: '首页', icon: Home },
   { path: '/process-matrix', label: '49过程矩阵', icon: LayoutGrid },
   { path: '/process-practice', label: '过程背诵练习', icon: GraduationCap },
-  { path: '/principles', label: '十二项原则', icon: BookMarked },
   { path: '/knowledge-areas', label: '知识领域', icon: BookOpen },
   { path: '/process-groups', label: '过程组', icon: Layers },
   { path: '/process-graph', label: '过程关系图', icon: Share2 },
+  { path: '/principles', label: '十二项原则', icon: BookMarked },
   { path: '/settings', label: '设置', icon: Settings },
 ]