style: improve formatting and import order consistency across codebase (#3761)

# Description of Changes

This pull request applies consistent formatting and import ordering
across the codebase. Specifically:

- Reordered imports according to the configured Spotless `importOrder()`
directive.
- Enabled formatting flags such as `trimTrailingWhitespace`,
`leadingTabsToSpaces`, and `endWithNewline`.
- Resolved inconsistencies in blank lines and spacing between imports
and annotations.
- Applied consistent formatting to annotations and method declarations.
- Removed unused or redundant import statements.

This change improves code readability, enforces a consistent style, and
prepares the codebase for future automated formatting checks.

---

## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [x] I have performed a self-review of my own code
- [x] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] 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)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

stirling-pdf/src/main/java/stirling/software/SPDF/SPDFApplication.java

@@ -219,7 +219,7 @@ public class SPDFApplication {
             log.info("Additional features in jar");
             return new String[] {"security"};
         } else {
-        	log.info("Without additional features in jar");
+            log.info("Without additional features in jar");
             return new String[] {"default"};
         }
     }

stirling-pdf/src/main/java/stirling/software/SPDF/config/CleanUrlInterceptor.java

@@ -13,11 +13,23 @@ import jakarta.servlet.http.HttpServletResponse;
 
 public class CleanUrlInterceptor implements HandlerInterceptor {
 
-	private static final List<String> ALLOWED_PARAMS = Arrays.asList(
-		    "lang", "endpoint", "endpoints", "logout", "error", "errorOAuth", "file", "messageType", "infoMessage",
-		    "page", "size", "type", "principal", "startDate", "endDate"
-		);
-
+    private static final List<String> ALLOWED_PARAMS =
+            Arrays.asList(
+                    "lang",
+                    "endpoint",
+                    "endpoints",
+                    "logout",
+                    "error",
+                    "errorOAuth",
+                    "file",
+                    "messageType",
+                    "infoMessage",
+                    "page",
+                    "size",
+                    "type",
+                    "principal",
+                    "startDate",
+                    "endDate");
 
     @Override
     public boolean preHandle(