fix: check wizard config for initialized flag instead of backend health

- App checks wizard API for harborforge.json config with initialized=true
- If not initialized, show embedded setup wizard (talks to wizard API via CORS)
- Setup saves config with initialized:true to wizard config volume
- After restart, backend reads config and starts, frontend sees initialized=true
- Remove VITE_API_BASE build arg (not needed, api.ts uses /api relative path)
- Fix Object.entries null crash in DashboardPage

src/pages/DashboardPage.tsx

@@ -28,7 +28,7 @@ export default function DashboardPage() {
           <span className="stat-number">{stats.total_issues}</span>
           <span className="stat-label">总 Issues</span>
         </div>
-        {Object.entries(stats.by_status).map(([k, v]) => (
+        {Object.entries(stats.by_status || {}).map(([k, v]) => (
           <div className="stat-card" key={k} style={{ borderLeftColor: statusColors[k] || '#ccc' }}>
             <span className="stat-number">{v}</span>
             <span className="stat-label">{k}</span>
@@ -39,7 +39,7 @@ export default function DashboardPage() {
       <div className="section">
         <h3>按优先级</h3>
         <div className="bar-chart">
-          {Object.entries(stats.by_priority).map(([k, v]) => (
+          {Object.entries(stats.by_priority || {}).map(([k, v]) => (
             <div className="bar-row" key={k}>
               <span className="bar-label">{k}</span>
               <div className="bar" style={{