fix(vmm): use custom gateway URL for dashboard when VM has custom kms/gw endpoints

When a VM is configured with custom gateway_urls, the dashboard URL (app_url)
should use the custom gateway's host and port instead of the global gateway config.

This fixes the issue where VMs with custom kms/gw endpoints would show incorrect
dashboard URLs pointing to the default gateway.

The fix parses the first gateway URL from the VM's custom gateway_urls and
extracts the host and port to construct the correct dashboard URL.

Author: kvinwang

vmm/src/app/qemu.rs

@@ -162,6 +162,11 @@ fn create_shared_disk(disk_path: impl AsRef<Path>, shared_dir: impl AsRef<Path>)
 impl VmInfo {
     pub fn to_pb(&self, gw: &GatewayConfig, brief: bool) -> pb::VmInfo {
         let workdir = VmWorkDir::new(&self.workdir);
+        let vm_config = workdir.manifest();
+        let custom_gateway_urls = vm_config
+            .as_ref()
+            .map(|c| c.gateway_urls.clone())
+            .unwrap_or_default();
         pb::VmInfo {
             id: self.manifest.id.clone(),
             name: self.manifest.name.clone(),
@@ -174,15 +179,10 @@ impl VmInfo {
             configuration: if brief {
                 None
             } else {
-                let vm_config = workdir.manifest();
                 let kms_urls = vm_config
                     .as_ref()
                     .map(|c| c.kms_urls.clone())
                     .unwrap_or_default();
-                let gateway_urls = vm_config
-                    .as_ref()
-                    .map(|c| c.gateway_urls.clone())
-                    .unwrap_or_default();
                 let no_tee = vm_config
                     .as_ref()
                     .map(|c| c.no_tee)
@@ -227,7 +227,7 @@ impl VmInfo {
                             .collect(),
                     }),
                     kms_urls,
-                    gateway_urls,
+                    gateway_urls: custom_gateway_urls.clone(),
                     stopped,
                     no_tee,
                 })
@@ -237,6 +237,28 @@ impl VmInfo {
                 .then_some(self.instance_id.as_ref())
                 .flatten()
                 .map(|id| {
+                    // Use custom gateway URL if available, otherwise fall back to global config
+                    if let Some(custom_gw_url) = custom_gateway_urls.first() {
+                        // Parse the gateway URL to extract host and port
+                        // Expected format: https://hostname[:port]
+                        if let Some(stripped) = custom_gw_url.strip_prefix("https://") {
+                            let (host, port) = if let Some((h, p)) = stripped.split_once(':') {
+                                // Remove any path component from port
+                                let port_str = p.split('/').next().unwrap_or(p);
+                                (h, port_str.parse().unwrap_or(443u16))
+                            } else {
+                                // Remove any path component from host
+                                let h = stripped.split('/').next().unwrap_or(stripped);
+                                (h, 443u16)
+                            };
+                            if port == 443 {
+                                return format!("https://{id}-{}.{}", gw.agent_port, host);
+                            } else {
+                                return format!("https://{id}-{}.{}:{}", gw.agent_port, host, port);
+                            }
+                        }
+                    }
+                    // Fall back to global gateway config
                     if gw.port == 443 {
                         format!("https://{id}-{}.{}", gw.agent_port, gw.base_domain)
                     } else {