Remove hardcoded fallback values from config loading

Frontend now shows actual values from backend without inventing defaults.
Empty fields shown as empty, not with made-up values.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/views/superadmin/DevicesView.vue

@@ -643,33 +643,33 @@ function showEditModal(device) {
   // Store original config for merging (don't lose ssh_tunnel, etc)
   originalDeviceConfig.value = JSON.parse(JSON.stringify(device.config || {}))
 
-  // Extract only fields we edit in interactive mode
+  // Extract fields from device config - no hardcoded defaults, use what backend sent
   config.value = {
-    force_cloud: device.config?.force_cloud ?? false,
-    cfg_polling_timeout: device.config?.cfg_polling_timeout ?? 30,
+    force_cloud: device.config?.force_cloud || false,
+    cfg_polling_timeout: device.config?.cfg_polling_timeout || '',
     ble: {
-      enabled: device.config?.ble?.enabled ?? true,
-      batch_interval_ms: device.config?.ble?.batch_interval_ms ?? 2500,
-      uuid_filter_hex: device.config?.ble?.uuid_filter_hex ?? '',
-      upload_endpoint: device.config?.ble?.upload_endpoint ?? ''
+      enabled: device.config?.ble?.enabled || false,
+      batch_interval_ms: device.config?.ble?.batch_interval_ms || '',
+      uuid_filter_hex: device.config?.ble?.uuid_filter_hex || '',
+      upload_endpoint: device.config?.ble?.upload_endpoint || ''
     },
     wifi: {
-      client_enabled: device.config?.wifi?.client_enabled ?? false,
-      ssid: device.config?.wifi?.ssid ?? '',
-      psk: device.config?.wifi?.psk ?? '',
-      monitor_enabled: device.config?.wifi?.monitor_enabled ?? true,
-      batch_interval_ms: device.config?.wifi?.batch_interval_ms ?? 10000,
-      upload_endpoint: device.config?.wifi?.upload_endpoint ?? ''
+      client_enabled: device.config?.wifi?.client_enabled || false,
+      ssid: device.config?.wifi?.ssid || '',
+      psk: device.config?.wifi?.psk || '',
+      monitor_enabled: device.config?.wifi?.monitor_enabled || false,
+      batch_interval_ms: device.config?.wifi?.batch_interval_ms || '',
+      upload_endpoint: device.config?.wifi?.upload_endpoint || ''
     },
     dashboard: {
-      enabled: device.config?.dashboard?.enabled ?? true
+      enabled: device.config?.dashboard?.enabled || false
     },
     net: {
       ntp: {
-        servers: device.config?.net?.ntp?.servers ?? ['pool.ntp.org', 'time.google.com']
+        servers: device.config?.net?.ntp?.servers || []
       }
     },
-    debug: device.config?.debug ?? false
+    debug: device.config?.debug || false
   }
 
   // Convert NTP servers array to comma-separated string
@@ -894,35 +894,35 @@ async function showDefaultConfigModal() {
   try {
     const configData = await devicesApi.getDefaultConfig()
 
-    // Load into interactive form
+    // Load from backend - no hardcoded defaults
     defaultConfig.value = {
-      force_cloud: configData.force_cloud ?? false,
-      cfg_polling_timeout: configData.cfg_polling_timeout ?? 30,
+      force_cloud: configData.force_cloud || false,
+      cfg_polling_timeout: configData.cfg_polling_timeout || '',
       ble: {
-        enabled: configData.ble?.enabled ?? true,
-        batch_interval_ms: configData.ble?.batch_interval_ms ?? 2500,
-        uuid_filter_hex: configData.ble?.uuid_filter_hex ?? '',
-        upload_endpoint: configData.ble?.upload_endpoint ?? ''
+        enabled: configData.ble?.enabled || false,
+        batch_interval_ms: configData.ble?.batch_interval_ms || '',
+        uuid_filter_hex: configData.ble?.uuid_filter_hex || '',
+        upload_endpoint: configData.ble?.upload_endpoint || ''
       },
       wifi: {
-        client_enabled: configData.wifi?.client_enabled ?? false,
-        ssid: configData.wifi?.ssid ?? '',
-        psk: configData.wifi?.psk ?? '',
-        monitor_enabled: configData.wifi?.monitor_enabled ?? true,
-        batch_interval_ms: configData.wifi?.batch_interval_ms ?? 10000,
-        upload_endpoint: configData.wifi?.upload_endpoint ?? ''
+        client_enabled: configData.wifi?.client_enabled || false,
+        ssid: configData.wifi?.ssid || '',
+        psk: configData.wifi?.psk || '',
+        monitor_enabled: configData.wifi?.monitor_enabled || false,
+        batch_interval_ms: configData.wifi?.batch_interval_ms || '',
+        upload_endpoint: configData.wifi?.upload_endpoint || ''
       },
       ssh_tunnel: configData.ssh_tunnel || {},
       dashboard_tunnel: configData.dashboard_tunnel || {},
       dashboard: {
-        enabled: configData.dashboard?.enabled ?? true
+        enabled: configData.dashboard?.enabled || false
       },
       net: {
         ntp: {
-          servers: configData.net?.ntp?.servers ?? ['pool.ntp.org', 'time.google.com']
+          servers: configData.net?.ntp?.servers || []
         }
       },
-      debug: configData.debug ?? false
+      debug: configData.debug || false
     }
 
     // Convert NTP servers to text