feat(admin): enhance adult verification file handling and localization

- Added a new method in AdminService to resolve adult verification file paths, improving file retrieval logic.
- Updated the AdminVerificationView to display a message when the verification document is missing.
- Localized the missing document message in German, English, and Spanish for better user experience.

backend/services/adminService.js

@@ -39,6 +39,27 @@ const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
 
 class AdminService {
+    resolveAdultVerificationFile(requestData) {
+        if (!requestData || typeof requestData !== 'object') {
+            return null;
+        }
+
+        const candidates = [];
+        if (requestData.fileName) {
+            candidates.push(path.join(__dirname, '..', 'images', 'adult-verification', requestData.fileName));
+        }
+        if (requestData.storedFileName && requestData.storedFileName !== requestData.fileName) {
+            candidates.push(path.join(__dirname, '..', 'images', 'adult-verification', requestData.storedFileName));
+        }
+        if (requestData.filePath) {
+            candidates.push(path.isAbsolute(requestData.filePath)
+                ? requestData.filePath
+                : path.join(__dirname, '..', requestData.filePath));
+        }
+
+        return candidates.find((candidate) => candidate && fs.existsSync(candidate)) || null;
+    }
+
     removeEroticStorageFile(type, hash) {
         if (!hash) {
             return;
@@ -302,13 +323,15 @@ class AdminService {
             } catch {
                 verificationRequest = null;
             }
+            const resolvedDocumentPath = this.resolveAdultVerificationFile(verificationRequest);
             return {
                 id: user.hashedId,
                 username: user.username,
                 active: !!user.active,
                 age,
                 adultVerificationStatus: verificationStatus,
-                adultVerificationRequest: verificationRequest
+                adultVerificationRequest: verificationRequest,
+                adultVerificationDocumentAvailable: !!resolvedDocumentPath
             };
         }).filter((row) => row.age !== null && row.age >= 18);
 
@@ -404,8 +427,8 @@ class AdminService {
             throw new Error('norequest');
         }
 
-        const filePath = path.join(__dirname, '..', 'images', 'adult-verification', requestData.fileName);
-        if (!fs.existsSync(filePath)) {
+        const filePath = this.resolveAdultVerificationFile(requestData);
+        if (!filePath) {
             throw new Error('nofile');
         }