fix: add @nullable annotation to fluent setter parameters when useJspecify is enabled

The Spring generator was missing @nullable annotations on fluent setter
parameters when useJspecify is enabled, while regular setters and getters
had them correctly applied. This created an inconsistent nullness contract
that caused static analysis tools to flag passing null to fluent setters as
errors, even though the underlying field is nullable.

Changes:
- Updated JavaSpring/pojo.mustache to use {{>nullableDataType}} instead of
  {{{datatypeWithEnum}}} for fluent setter parameters
- Applied the same fix to inherited property fluent setters
- Updated java-camel-server/pojo.mustache with the same fix (extends SpringCodegen)

This ensures consistent nullness annotations across:
- Fields: private @nullable String firstName;
- Getters: public @nullable String getFirstName()
- Regular setters: public void setFirstName(@nullable String firstName)
- Fluent setters: public UserBase firstName(@nullable String firstName)

Author: swapneswarsundarray

modules/openapi-generator/src/main/resources/JavaSpring/pojo.mustache

@@ -144,7 +144,7 @@ public {{>sealed}}class {{classname}}{{#parent}} extends {{{parent}}}{{/parent}}
   {{^lombok.Data}}
 
   {{! begin feature: fluent setter methods }}
-  public {{classname}} {{name}}({{>nullableAnnotation}}{{{datatypeWithEnum}}} {{name}}) {
+  public {{classname}} {{name}}({{>nullableAnnotation}}{{>nullableDataType}} {{name}}) {
     {{#openApiNullable}}
     this.{{name}} = {{#isNullable}}JsonNullable.of({{/isNullable}}{{#useOptional}}{{^required}}{{^isNullable}}{{^isContainer}}Optional.of{{#optionalAcceptNullable}}Nullable{{/optionalAcceptNullable}}({{/isContainer}}{{/isNullable}}{{/required}}{{/useOptional}}{{name}}{{#isNullable}}){{/isNullable}}{{#useOptional}}{{^required}}{{^isNullable}}{{^isContainer}}){{/isContainer}}{{/isNullable}}{{/required}}{{/useOptional}};
     {{/openApiNullable}}
@@ -260,7 +260,7 @@ public {{>sealed}}class {{classname}}{{#parent}} extends {{{parent}}}{{/parent}}
 
   {{^lombok.Setter}}
   {{! begin feature: fluent setter methods for inherited properties }}
-  public {{classname}} {{name}}({{{datatypeWithEnum}}} {{name}}) {
+  public {{classname}} {{name}}({{>nullableAnnotation}}{{>nullableDataType}} {{name}}) {
     super.{{name}}({{name}});
     return this;
   }

modules/openapi-generator/src/main/resources/java-camel-server/pojo.mustache

@@ -155,7 +155,7 @@ public class {{classname}}{{#parent}} extends {{{parent}}}{{/parent}}{{^parent}}
   {{^lombok.Data}}
 
   {{! begin feature: fluent setter methods }}
-  public {{classname}} {{name}}({{{datatypeWithEnum}}} {{name}}) {
+  public {{classname}} {{name}}({{>nullableDataType}} {{name}}) {
     {{#openApiNullable}}
     this.{{name}} = {{#isNullable}}JsonNullable.of({{/isNullable}}{{#useOptional}}{{^required}}{{^isNullable}}{{^isContainer}}Optional.of({{/isContainer}}{{/isNullable}}{{/required}}{{/useOptional}}{{name}}{{#isNullable}}){{/isNullable}}{{#useOptional}}{{^required}}{{^isNullable}}{{^isContainer}}){{/isContainer}}{{/isNullable}}{{/required}}{{/useOptional}};
     {{/openApiNullable}}
@@ -280,7 +280,7 @@ public class {{classname}}{{#parent}} extends {{{parent}}}{{/parent}}{{^parent}}
 
   {{^lombok.Setter}}
   {{! begin feature: fluent setter methods for inherited properties }}
-  public {{classname}} {{name}}({{{datatypeWithEnum}}} {{name}}) {
+  public {{classname}} {{name}}({{>nullableDataType}} {{name}}) {
     super.{{name}}({{name}});
     return this;
   }

samples/client/petstore/spring-cloud-deprecated/src/main/java/org/openapitools/model/Pet.java

@@ -135,7 +135,7 @@ public void setCategory(@Nullable Category category) {
     this.category = category;
   }
 
-  public Pet name(String name) {
+  public Pet name(JsonNullable<String> name) {
     this.name = JsonNullable.of(name);
     return this;
   }

samples/client/petstore/spring-http-interface-noResponseEntity/src/main/java/org/openapitools/model/AdditionalPropertiesClassDto.java

@@ -303,7 +303,7 @@ public void setAnytype1(@Nullable Object anytype1) {
     this.anytype1 = anytype1;
   }
 
-  public AdditionalPropertiesClassDto anytype2(Object anytype2) {
+  public AdditionalPropertiesClassDto anytype2(JsonNullable<Object> anytype2) {
     this.anytype2 = JsonNullable.of(anytype2);
     return this;
   }

samples/client/petstore/spring-http-interface-noResponseEntity/src/main/java/org/openapitools/model/BigCatDto.java

@@ -94,7 +94,7 @@ public void setKind(@Nullable KindEnum kind) {
   }
 
 
-  public BigCatDto declawed(Boolean declawed) {
+  public BigCatDto declawed(@Nullable Boolean declawed) {
     super.declawed(declawed);
     return this;
   }

samples/client/petstore/spring-http-interface-noResponseEntity/src/main/java/org/openapitools/model/ChildWithNullableDto.java

@@ -53,12 +53,12 @@ public void setOtherProperty(@Nullable String otherProperty) {
   }
 
 
-  public ChildWithNullableDto type(TypeEnum type) {
+  public ChildWithNullableDto type(@Nullable TypeEnum type) {
     super.type(type);
     return this;
   }
 
-  public ChildWithNullableDto nullableProperty(String nullableProperty) {
+  public ChildWithNullableDto nullableProperty(JsonNullable<String> nullableProperty) {
     super.nullableProperty(nullableProperty);
     return this;
   }

samples/client/petstore/spring-http-interface-noResponseEntity/src/main/java/org/openapitools/model/ContainerDefaultValueDto.java

@@ -43,7 +43,7 @@ public ContainerDefaultValueDto() {
     super();
   }
 
-  public ContainerDefaultValueDto nullableArray(List<String> nullableArray) {
+  public ContainerDefaultValueDto nullableArray(JsonNullable<List<String>> nullableArray) {
     this.nullableArray = JsonNullable.of(nullableArray);
     return this;
   }
@@ -70,7 +70,7 @@ public void setNullableArray(JsonNullable<List<String>> nullableArray) {
     this.nullableArray = nullableArray;
   }
 
-  public ContainerDefaultValueDto nullableRequiredArray(List<String> nullableRequiredArray) {
+  public ContainerDefaultValueDto nullableRequiredArray(JsonNullable<List<String>> nullableRequiredArray) {
     this.nullableRequiredArray = JsonNullable.of(nullableRequiredArray);
     return this;
   }
@@ -126,7 +126,7 @@ public void setRequiredArray(List<String> requiredArray) {
     this.requiredArray = requiredArray;
   }
 
-  public ContainerDefaultValueDto nullableArrayWithDefault(List<String> nullableArrayWithDefault) {
+  public ContainerDefaultValueDto nullableArrayWithDefault(JsonNullable<List<String>> nullableArrayWithDefault) {
     this.nullableArrayWithDefault = JsonNullable.of(nullableArrayWithDefault);
     return this;
   }

samples/client/petstore/spring-http-interface-noResponseEntity/src/main/java/org/openapitools/model/NullableMapPropertyDto.java

@@ -30,7 +30,7 @@ public class NullableMapPropertyDto {
 
   private JsonNullable<Map<String, String>> languageValues = JsonNullable.<Map<String, String>>undefined();
 
-  public NullableMapPropertyDto languageValues(Map<String, String> languageValues) {
+  public NullableMapPropertyDto languageValues(JsonNullable<Map<String, String>> languageValues) {
     this.languageValues = JsonNullable.of(languageValues);
     return this;
   }

samples/client/petstore/spring-http-interface-noResponseEntity/src/main/java/org/openapitools/model/ParentWithNullableDto.java

@@ -94,7 +94,7 @@ public void setType(@Nullable TypeEnum type) {
     this.type = type;
   }
 
-  public ParentWithNullableDto nullableProperty(String nullableProperty) {
+  public ParentWithNullableDto nullableProperty(JsonNullable<String> nullableProperty) {
     this.nullableProperty = JsonNullable.of(nullableProperty);
     return this;
   }

samples/client/petstore/spring-http-interface-reactive-noResponseEntity/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java

@@ -301,7 +301,7 @@ public void setAnytype1(@Nullable Object anytype1) {
     this.anytype1 = anytype1;
   }
 
-  public AdditionalPropertiesClass anytype2(Object anytype2) {
+  public AdditionalPropertiesClass anytype2(JsonNullable<Object> anytype2) {
     this.anytype2 = JsonNullable.of(anytype2);
     return this;
   }