Refactor codebase to replace explicit constructors with Lombok annotations and remove boilerplat (#3415)

# Description of Changes

- **What was changed:**  
- Removed explicit constructor definitions annotated with `@Autowired`
across services, controllers, filters, and schedulers.
- Added Lombok’s `@RequiredArgsConstructor` to automatically generate
required-args constructors and eliminate boilerplate.
- Introduced other Lombok annotations (`@Data`, `@Getter`, `@Setter`,
`@EqualsAndHashCode`, `@NoArgsConstructor`) on model and API classes to
replace manual getters/setters and constructors.
- Standardized string comparisons to use the constant-first form (e.g.,
`"value".equals(variable)`).
- Cleaned up unused imports and organized OpenAPI configuration by
extracting default title/description constants.

- **Why the change was made:**  
  - To reduce repetitive boilerplate code and improve maintainability.  
- To leverage Lombok for cleaner, more consistent dependency injection
and data modeling.
  - To ensure a uniform coding style across the entire codebase.

#3406

---

## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] 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  

### 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.

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

@@ -12,19 +12,18 @@ import io.swagger.v3.oas.annotations.tags.Tag;
 
 import jakarta.servlet.http.HttpServletRequest;
 
+import lombok.RequiredArgsConstructor;
+
 import stirling.software.SPDF.config.security.database.DatabaseService;
 import stirling.software.SPDF.utils.FileInfo;
 
 @Controller
 @Tag(name = "Database Management", description = "Database management and security APIs")
+@RequiredArgsConstructor
 public class DatabaseWebController {
 
     private final DatabaseService databaseService;
 
-    public DatabaseWebController(DatabaseService databaseService) {
-        this.databaseService = databaseService;
-    }
-
     @PreAuthorize("hasRole('ROLE_ADMIN')")
     @GetMapping("/database")
     public String database(HttpServletRequest request, Model model, Authentication authentication) {

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

@@ -19,6 +19,7 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 
 import io.swagger.v3.oas.annotations.Hidden;
 
+import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
 import stirling.software.SPDF.model.ApplicationProperties;
@@ -26,14 +27,11 @@ import stirling.software.SPDF.model.Dependency;
 
 @Controller
 @Slf4j
+@RequiredArgsConstructor
 public class HomeWebController {
 
     private final ApplicationProperties applicationProperties;
 
-    public HomeWebController(ApplicationProperties applicationProperties) {
-        this.applicationProperties = applicationProperties;
-    }
-
     @GetMapping("/about")
     @Hidden
     public String gameForm(Model model) {

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

@@ -19,6 +19,7 @@ import io.swagger.v3.oas.annotations.tags.Tag;
 
 import jakarta.annotation.PostConstruct;
 
+import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
 import stirling.software.SPDF.config.EndpointInspector;
@@ -29,6 +30,7 @@ import stirling.software.SPDF.model.ApplicationProperties;
 @RequestMapping("/api/v1/info")
 @Tag(name = "Info", description = "Info APIs")
 @Slf4j
+@RequiredArgsConstructor
 public class MetricsController {
 
     private final ApplicationProperties applicationProperties;
@@ -36,15 +38,6 @@ public class MetricsController {
     private final EndpointInspector endpointInspector;
     private boolean metricsEnabled;
 
-    public MetricsController(
-            ApplicationProperties applicationProperties,
-            MeterRegistry meterRegistry,
-            EndpointInspector endpointInspector) {
-        this.applicationProperties = applicationProperties;
-        this.meterRegistry = meterRegistry;
-        this.endpointInspector = endpointInspector;
-    }
-
     @PostConstruct
     public void init() {
         Boolean metricsEnabled = applicationProperties.getMetrics().getEnabled();

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

@@ -13,19 +13,18 @@ import org.springframework.web.servlet.ModelAndView;
 import io.swagger.v3.oas.annotations.Hidden;
 import io.swagger.v3.oas.annotations.tags.Tag;
 
+import lombok.RequiredArgsConstructor;
+
 import stirling.software.SPDF.model.ApplicationProperties;
 import stirling.software.SPDF.utils.CheckProgramInstall;
 
 @Controller
 @Tag(name = "Misc", description = "Miscellaneous APIs")
+@RequiredArgsConstructor
 public class OtherWebController {
 
     private final ApplicationProperties applicationProperties;
 
-    public OtherWebController(ApplicationProperties applicationProperties) {
-        this.applicationProperties = applicationProperties;
-    }
-
     @GetMapping("/compress-pdf")
     @Hidden
     public String compressPdfForm(Model model) {
@@ -122,7 +121,7 @@ public class OtherWebController {
         return Arrays.stream(files)
                 .filter(file -> file.getName().endsWith(".traineddata"))
                 .map(file -> file.getName().replace(".traineddata", ""))
-                .filter(lang -> !lang.equalsIgnoreCase("osd"))
+                .filter(lang -> !"osd".equalsIgnoreCase(lang))
                 .sorted()
                 .toList();
     }