fix: allow domain names for APT Cacher in container creation UI

- Add validateHostname and validateAptCacherAddress (IPv4 or hostname)
- Use new validator for var_apt_cacher_ip; error message: Invalid IPv4 or hostname
- Label: APT Cacher host or IP; placeholder shows IP or hostname example

Fixes #404

src/app/_components/ConfigurationModal.tsx

@@ -199,6 +199,17 @@ export function ConfigurationModal({
     return !isNaN(num) && num > 0;
   };
 
+  const validateHostname = (hostname: string): boolean => {
+    if (!hostname || hostname.length > 253) return false;
+    const label = /^[a-zA-Z0-9]([a-zA-Z0-9-]*[a-zA-Z0-9])?$/;
+    const labels = hostname.split('.');
+    return labels.length >= 1 && labels.every(l => l.length >= 1 && l.length <= 63 && label.test(l));
+  };
+
+  const validateAptCacherAddress = (value: string): boolean => {
+    return validateIPv4(value) || validateHostname(value);
+  };
+
   const validateForm = (): boolean => {
     const newErrors: Record<string, string> = {};
 
@@ -216,8 +227,8 @@ export function ConfigurationModal({
       if (advancedVars.var_ns && !validateIPv4(advancedVars.var_ns as string)) {
         newErrors.var_ns = 'Invalid IPv4 address';
       }
-      if (advancedVars.var_apt_cacher_ip && !validateIPv4(advancedVars.var_apt_cacher_ip as string)) {
-        newErrors.var_apt_cacher_ip = 'Invalid IPv4 address';
+      if (advancedVars.var_apt_cacher_ip && !validateAptCacherAddress(advancedVars.var_apt_cacher_ip as string)) {
+        newErrors.var_apt_cacher_ip = 'Invalid IPv4 address or hostname';
       }
       // Validate IPv4 CIDR if network mode is static
       const netValue = advancedVars.var_net;
@@ -904,13 +915,13 @@ export function ConfigurationModal({
                   </div>
                   <div>
                     <label className="block text-sm font-medium text-foreground mb-2">
-                      APT Cacher IP
+                      APT Cacher host or IP
                     </label>
                     <Input
                       type="text"
                       value={typeof advancedVars.var_apt_cacher_ip === 'boolean' ? '' : String(advancedVars.var_apt_cacher_ip ?? '')}
                       onChange={(e) => updateAdvancedVar('var_apt_cacher_ip', e.target.value)}
-                      placeholder="192.168.1.10"
+                      placeholder="192.168.1.10 or apt-cacher.internal"
                       className={errors.var_apt_cacher_ip ? 'border-destructive' : ''}
                     />
                     {errors.var_apt_cacher_ip && (

src/server/api/routers/installedScripts.ts

@@ -2068,32 +2068,72 @@ export const installedScriptsRouter = createTRPCRouter({
           };
         }
 
-        // Get the script's interface_port from metadata (prioritize metadata over existing database values)
-        let detectedPort = 80; // Default fallback
-        
+        // Resolve app slug from /usr/bin/update (community-scripts) when available; else from hostname/suffix.
+        let slugFromUpdate: string | null = null;
+        try {
+          const updateCommand = `pct exec ${scriptData.container_id} -- cat /usr/bin/update 2>/dev/null`;
+          let updateOutput = '';
+          await new Promise<void>((resolve) => {
+            void sshExecutionService.executeCommand(
+              server as Server,
+              updateCommand,
+              (data: string) => { updateOutput += data; },
+              () => {},
+              () => resolve()
+            );
+          });
+          const ctSlugMatch = /ct\/([a-zA-Z0-9_.-]+)\.sh/.exec(updateOutput);
+          if (ctSlugMatch?.[1]) {
+            slugFromUpdate = ctSlugMatch[1].trim().toLowerCase();
+            console.log('🔍 Slug from /usr/bin/update:', slugFromUpdate);
+          }
+        } catch {
+          // Container may not be from community-scripts; use hostname fallback
+        }
+
+        // Get the script's interface_port from metadata. Primary: slug from /usr/bin/update; fallback: hostname/suffix.
+        let detectedPort = 80; // Default fallback
+
         try {
-          // Import localScriptsService to get script metadata
           const { localScriptsService } = await import('~/server/services/localScripts');
-          
-          // Get all scripts and find the one matching our script name
           const allScripts = await localScriptsService.getAllScripts();
-          
-          // Extract script slug from script_name (remove .sh extension)
-          const scriptSlug = scriptData.script_name.replace(/\.sh$/, '');
-          console.log('🔍 Looking for script with slug:', scriptSlug);
-          
-          const scriptMetadata = allScripts.find(script => script.slug === scriptSlug);
-          
+
+          const nameFromHostname = scriptData.script_name.replace(/\.sh$/, '').toLowerCase();
+
+          // Primary: slug from /usr/bin/update (community-scripts)
+          let scriptMetadata =
+            slugFromUpdate != null
+              ? allScripts.find((s) => s.slug === slugFromUpdate)
+              : undefined;
+          if (scriptMetadata) {
+            console.log('🔍 Using slug from /usr/bin/update for metadata:', scriptMetadata.slug);
+          }
+
+          // Fallback: exact hostname then hostname ends with slug (longest wins)
+          if (!scriptMetadata) {
+            scriptMetadata = allScripts.find((script) => script.slug === nameFromHostname);
+            if (!scriptMetadata) {
+              const suffixMatches = allScripts.filter((script) => nameFromHostname.endsWith(script.slug));
+              scriptMetadata =
+                suffixMatches.length > 0
+                  ? suffixMatches.reduce((a, b) => (a.slug.length >= b.slug.length ? a : b))
+                  : undefined;
+              if (scriptMetadata) {
+                console.log('🔍 Matched metadata by slug suffix in hostname:', scriptMetadata.slug);
+              }
+            }
+          }
+
           if (scriptMetadata?.interface_port) {
             detectedPort = scriptMetadata.interface_port;
             console.log('📋 Found interface_port in metadata:', detectedPort);
           } else {
             console.log('📋 No interface_port found in metadata, using default port 80');
-            detectedPort = 80; // Default to port 80 if no metadata port found
+            detectedPort = 80;
           }
         } catch (error) {
           console.log('⚠️ Error getting script metadata, using default port 80:', error);
-          detectedPort = 80; // Default to port 80 if metadata lookup fails
+          detectedPort = 80;
         }
         
         console.log('🎯 Final detected port:', detectedPort);