fix: update docker-compose network to external and enhance avatar URL resolution logic

frontend/src/lib/utils.ts

@@ -43,18 +43,23 @@ function parseAbsoluteLikeUrl(value: string): URL | null {
 	if (!trimmed) return null;
 
 	try {
-		return new URL(trimmed);
-	} catch {
-		// Soporta formato host:puerto/ruta sin protocolo.
-		if (/^[a-z0-9.-]+:\d+\//i.test(trimmed)) {
-			try {
-				return new URL(`http://${trimmed}`);
-			} catch {
-				return null;
-			}
+		const parsed = new URL(trimmed);
+		if (parsed.protocol === 'http:' || parsed.protocol === 'https:') {
+			return parsed;
 		}
-		return null;
+	} catch {
 	}
+
+	// Soporta formato host:puerto/ruta sin protocolo.
+	if (/^[a-z0-9.-]+:\d+\//i.test(trimmed)) {
+		try {
+			return new URL(`http://${trimmed}`);
+		} catch {
+			return null;
+		}
+	}
+
+	return null;
 }
 
 function rewriteInternalHostToPublicUrl(value: string): string {