formattingand autowired constructors (#2557)

# Description
This pull request includes several changes aimed at improving the code
structure and removing redundant code. The most significant changes
involve reordering methods, removing unnecessary annotations, and
refactoring constructors to use dependency injection.
Autowired now comes via constructor (which also doesn't need autowired
annotation as its done by default for configuration)



## Checklist

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have performed a self-review of my own code
- [ ] I have attached images of the change if it is UI based
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] If my code has heavily changed functionality I have updated
relevant docs on [Stirling-PDFs doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
- [ ] My changes generate no new warnings
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

src/main/java/stirling/software/SPDF/controller/web/SignatureController.java

@@ -18,10 +18,16 @@ import stirling.software.SPDF.service.SignatureService;
 @RequestMapping("/api/v1/general")
 public class SignatureController {
 
-    @Autowired private SignatureService signatureService;
+    private final SignatureService signatureService;
 
-    @Autowired(required = false)
-    private UserServiceInterface userService;
+    private final UserServiceInterface userService;
+
+    public SignatureController(
+            SignatureService signatureService,
+            @Autowired(required = false) UserServiceInterface userService) {
+        this.signatureService = signatureService;
+        this.userService = userService;
+    }
 
     @GetMapping("/sign/{fileName}")
     public ResponseEntity<byte[]> getSignature(@PathVariable(name = "fileName") String fileName)
@@ -30,15 +36,14 @@ public class SignatureController {
         if (userService != null) {
             username = userService.getCurrentUsername();
         }
-
         // Verify access permission
         if (!signatureService.hasAccessToFile(username, fileName)) {
             return ResponseEntity.status(HttpStatus.FORBIDDEN).build();
         }
-
         byte[] imageBytes = signatureService.getSignatureBytes(username, fileName);
         return ResponseEntity.ok()
-                .contentType(MediaType.IMAGE_JPEG) // Adjust based on file type
+                .contentType( // Adjust based on file type
+                        MediaType.IMAGE_JPEG)
                 .body(imageBytes);
     }
 }