앱 위젯에서 구분선 리사이즈 안되는 문제 수정

backend/src/main/java/com/goldenchart/service/MobileAppReleaseService.java

@@ -57,12 +57,11 @@ public class MobileAppReleaseService {
             Instant updated = Files.getLastModifiedTime(file).toInstant();
             String base = normalizeBase(publicBaseUrl);
             String downloadUrl = base + "/api/mobile-app/download/android";
+            String version = resolveApkVersion(file);
             return MobileAppReleaseInfoDto.builder()
                     .available(true)
                     .fileName(file.getFileName().toString())
-                    .version(configuredVersion != null && !configuredVersion.isBlank()
-                            ? configuredVersion
-                            : DT_FMT.format(updated))
+                    .version(version)
                     .sizeBytes(size)
                     .updatedAt(DT_FMT.format(updated))
                     .downloadUrl(downloadUrl)
@@ -141,4 +140,29 @@ public class MobileAppReleaseService {
         }
         return publicBaseUrl.replaceAll("/+$", "");
     }
+
+    /** APK와 함께 기록된 .version sidecar → .env configuredVersion → 파일 수정 시각 */
+    private String resolveApkVersion(Path apkFile) {
+        String apkName = apkFile.getFileName().toString();
+        Path sidecar = apkFile.getParent().resolve(
+                apkName.replaceAll("(?i)\\.apk$", "") + ".version");
+        try {
+            if (Files.isRegularFile(sidecar)) {
+                String fromFile = Files.readString(sidecar).trim();
+                if (!fromFile.isBlank()) {
+                    return fromFile;
+                }
+            }
+        } catch (IOException e) {
+            log.warn("[mobile-app] read version sidecar failed: {}", e.getMessage());
+        }
+        if (configuredVersion != null && !configuredVersion.isBlank()) {
+            return configuredVersion.trim();
+        }
+        try {
+            return DT_FMT.format(Files.getLastModifiedTime(apkFile).toInstant());
+        } catch (IOException e) {
+            return "unknown";
+        }
+    }
 }