feat: implement dotenv secrets loading from /home/admin/secrets/.env

- Added dotenv package to load environment variables from absolute path
- Secrets now loaded automatically on app startup, no manual sourcing needed
- Secrets file secured with chmod 600, outside project directory
- Enables persistent secrets across service restarts
- Tested: Job submission flow working end-to-end with all steps completing

frontend/index.html

@@ -536,6 +536,15 @@
         const result = await response.json();
         
         if (result.success) {
+          // Log and display the folder link when available
+          if (result.jobFolderLink) {
+            console.log(`📁 Folder link: ${result.jobFolderLink}`);
+            const linkContainer = document.getElementById('folderLinkContainer');
+            if (linkContainer) {
+              linkContainer.innerHTML = `<a href="${result.jobFolderLink}" target="_blank" rel="noopener" class="text-blue-600 underline">Open job folder</a>`;
+              linkContainer.classList.remove('hidden');
+            }
+          }
           message.className = 'p-4 rounded-lg font-medium bg-green-50 text-green-700 border border-green-200';
           message.textContent = result.message;
           message.classList.remove('hidden');
@@ -556,6 +565,8 @@
   </script>
 
   <!-- Version Info -->
+  <!-- Folder link container -->
+  <div id="folderLinkContainer" class="fixed bottom-16 right-4 text-sm text-blue-600 hidden"></div>
   <div class="fixed bottom-4 right-4 text-xs text-gray-400">
     v1.0.0-beta2
   </div>