Fix Frontend Issues: CSP, Chart Height, and Logout

- Add CSP settings explicitly to local.py to ensure they are active
- Implement logout API endpoint (view and url) to fix 404
- Add min-height to chart container in PlatformDashboard to fix recharts error

frontend/src/pages/platform/PlatformDashboard.tsx

@@ -63,7 +63,7 @@ const PlatformDashboard: React.FC = () => {
       {/* MRR Chart */}
       <div className="bg-white dark:bg-gray-800 p-6 rounded-xl border border-gray-200 dark:border-gray-700 shadow-sm">
         <h3 className="text-lg font-semibold text-gray-900 dark:text-white mb-6">{t('platform.mrrGrowth')}</h3>
-        <div className="h-80">
+        <div className="h-80 min-h-[320px]">
           <ResponsiveContainer width="100%" height="100%">
             <AreaChart data={data}>
               <defs>