fix: correct historical analysis endpoint and Chart.js loading

- Fix endpoint to use get_all_pods() instead of non-existent get_pods_by_selector()
- Move Chart.js scripts to end of body for proper loading order
- Add proper error handling for workload not found cases
- Ensure Chart.js is available before creating graphs

app/static/index.html

@@ -17,9 +17,6 @@
     <!-- Font Awesome for icons -->
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
     
-    <!-- Chart.js for historical analysis graphs -->
-    <script src="https://cdn.jsdelivr.net/npm/chart.js@4.4.0/dist/chart.min.js"></script>
-    <script src="https://cdn.jsdelivr.net/npm/chartjs-adapter-date-fns@3.0.0/dist/chartjs-adapter-date-fns.bundle.min.js"></script>
     
     <!-- Custom OpenShift-like styles -->
     <style>
@@ -1668,5 +1665,9 @@
                 `;
         }
     </script>
+    
+    <!-- Chart.js for historical analysis graphs -->
+    <script src="https://cdn.jsdelivr.net/npm/chart.js@4.4.0/dist/chart.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/chartjs-adapter-date-fns@3.0.0/dist/chartjs-adapter-date-fns.bundle.min.js"></script>
 </body>
 </html>