style(导航): 隐藏流程总览图页面入口

- App.tsx 移除 /process-roadmap 路由及组件导入
- 首页功能入口卡片移除"流程总览图"
- 侧边栏导航移除"流程总览图"链接
- ProcessDetailPage 移除"返回总览图"按钮及相关逻辑

via [HAPI](https://hapi.run)

Co-Authored-By: HAPI <noreply@hapi.run>

src/pages/ProcessDetailPage.tsx

@@ -1,6 +1,6 @@
 import { useParams, Link, useLocation, useNavigate } from 'react-router-dom'
 import { motion } from 'framer-motion'
-import { ArrowLeft, ArrowRight, FileText, Wrench, FileOutput, LayoutGrid, Workflow, Eye, EyeOff, Info } from 'lucide-react'
+import { ArrowLeft, ArrowRight, FileText, Wrench, FileOutput, LayoutGrid, Eye, EyeOff, Info } from 'lucide-react'
 import { getProcessDetail, processes } from '@/data'
 import { useState, useEffect } from 'react'
 
@@ -53,7 +53,6 @@ export function ProcessDetailPage() {
   }
 
   const fromMatrix = location.state?.from === 'matrix'
-  const fromRoadmap = location.state?.from === 'roadmap'
 
   if (!processDetail) {
     return (
@@ -87,15 +86,6 @@ export function ProcessDetailPage() {
             返回矩阵
           </button>
         )}
-        {fromRoadmap && (
-          <button
-            onClick={() => navigate('/process-roadmap')}
-            className="flex items-center gap-1.5 px-2.5 py-1 rounded-lg bg-amber-50 dark:bg-amber-900/30 text-amber-700 dark:text-amber-300 hover:bg-amber-100 dark:hover:bg-amber-900/50 transition-colors font-medium"
-          >
-            <Workflow size={14} />
-            返回总览图
-          </button>
-        )}
         <nav className="flex items-center gap-1.5 text-gray-500 dark:text-gray-400">
           <Link to="/knowledge-areas" className="hover:text-indigo-600 dark:hover:text-indigo-400">知识领域</Link>
           <span>/</span>