feat: 新增流程总览图页面及导航功能

添加流程总览图页面，包含五组十域可交互SVG流程图，支持模块点击跳转至对应流程详情页。同时在侧边栏和首页添加导航入口，优化流程详情页的返回逻辑和布局样式。

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, User, Target, Clock, MapPin, HelpCircle, Cog } from 'lucide-react'
+import { ArrowLeft, ArrowRight, FileText, Wrench, FileOutput, LayoutGrid, Workflow, User, Target, Clock, MapPin, HelpCircle, Cog } from 'lucide-react'
 import { getProcessDetail, processes, artifactMap, toolMap } from '@/data'
 
 // 5W1H图标和标签配置
@@ -20,6 +20,7 @@ export function ProcessDetailPage() {
   const processDetail = id ? getProcessDetail(id) : null
 
   const fromMatrix = location.state?.from === 'matrix'
+  const fromRoadmap = location.state?.from === 'roadmap'
 
   if (!processDetail) {
     return (
@@ -53,6 +54,15 @@ 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>
@@ -205,6 +215,7 @@ export function ProcessDetailPage() {
         {prevProcess ? (
           <Link
             to={`/process/${prevProcess.id}`}
+            state={location.state}
             className="flex items-center gap-2 text-gray-600 dark:text-gray-400 hover:text-indigo-600 dark:hover:text-indigo-400 transition-colors text-sm"
           >
             <ArrowLeft size={16} />
@@ -217,6 +228,7 @@ export function ProcessDetailPage() {
         {nextProcess ? (
           <Link
             to={`/process/${nextProcess.id}`}
+            state={location.state}
             className="flex items-center gap-2 text-gray-600 dark:text-gray-400 hover:text-indigo-600 dark:hover:text-indigo-400 transition-colors text-right text-sm"
           >
             <div>