refactor(factories): Replace manual blank checks with StringHelper.defaultIfBlank()

- Update McpServerPromptFactory, McpServerResourceFactory, and McpServerToolFactory
- Replace manual isBlank() checks with StringHelper.defaultIfBlank() method
- Simplify code and improve readability across multiple factory classes

Author: codeboyzhou

src/main/java/com/github/codeboyzhou/mcp/declarative/server/factory/McpServerPromptFactory.java

@@ -38,7 +38,7 @@ protected McpServerPromptFactory(Injector injector) {
     @Override
     public McpServerFeatures.AsyncPromptSpecification create(Class<?> clazz, Method method) {
         McpPrompt promptMethod = method.getAnnotation(McpPrompt.class);
-        final String name = promptMethod.name().isBlank() ? method.getName() : promptMethod.name();
+        final String name = StringHelper.defaultIfBlank(promptMethod.name(), method.getName());
         final String title = StringHelper.defaultIfBlank(promptMethod.title(), NO_TITLE_SPECIFIED);
         final String description = getDescription(promptMethod.descriptionI18nKey(), promptMethod.description());
         List<McpSchema.PromptArgument> promptArguments = createPromptArguments(method);

src/main/java/com/github/codeboyzhou/mcp/declarative/server/factory/McpServerResourceFactory.java

@@ -31,7 +31,7 @@ protected McpServerResourceFactory(Injector injector) {
     @Override
     public McpServerFeatures.AsyncResourceSpecification create(Class<?> clazz, Method method) {
         McpResource res = method.getAnnotation(McpResource.class);
-        final String name = res.name().isBlank() ? method.getName() : res.name();
+        final String name = StringHelper.defaultIfBlank(res.name(), method.getName());
         final String title = StringHelper.defaultIfBlank(res.title(), NO_TITLE_SPECIFIED);
         final String description = getDescription(res.descriptionI18nKey(), res.description());
         McpSchema.Annotations annotations = new McpSchema.Annotations(List.of(res.roles()), res.priority());

src/main/java/com/github/codeboyzhou/mcp/declarative/server/factory/McpServerToolFactory.java

@@ -43,7 +43,7 @@ protected McpServerToolFactory(Injector injector) {
     @Override
     public McpServerFeatures.AsyncToolSpecification create(Class<?> clazz, Method method) {
         McpTool toolMethod = method.getAnnotation(McpTool.class);
-        final String name = toolMethod.name().isBlank() ? method.getName() : toolMethod.name();
+        final String name = StringHelper.defaultIfBlank(toolMethod.name(), method.getName());
         final String title = StringHelper.defaultIfBlank(toolMethod.title(), NO_TITLE_SPECIFIED);
         final String description = getDescription(toolMethod.descriptionI18nKey(), toolMethod.description());
         McpSchema.JsonSchema paramSchema = createJsonSchema(method);
@@ -139,7 +139,7 @@ private Map<String, Object> createJsonSchemaDefinition(Class<?> definitionClass)
             fieldProperties.put("type", field.getType().getSimpleName().toLowerCase());
             fieldProperties.put("description", getDescription(property.descriptionI18nKey(), property.description()));
 
-            final String fieldName = property.name().isBlank() ? field.getName() : property.name();
+            final String fieldName = StringHelper.defaultIfBlank(property.name(), field.getName());
             properties.put(fieldName, fieldProperties);
 
             if (property.required()) {