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

Dockerfile

@@ -4,9 +4,7 @@ WORKDIR /app
 COPY package.json package-lock.json* ./
 RUN npm install
 COPY . .
-ARG VITE_API_BASE=/api
 ARG VITE_WIZARD_PORT=18080
-ENV VITE_API_BASE=$VITE_API_BASE
 ENV VITE_WIZARD_PORT=$VITE_WIZARD_PORT
 RUN npm run build