Add @JsonIgnore annotation to jsonSchema field in AI provider APIs

Add @JsonIgnore annotation to the jsonSchema field in Function classes across
multiple AI provider APIs (MiniMax, MistralAI, OpenAI, ZhiPuAI) to exclude
it from JSON serialization.

Author: tzolov

models/spring-ai-minimax/src/main/java/org/springframework/ai/minimax/api/MiniMaxApi.java

@@ -22,6 +22,7 @@
 import java.util.function.Consumer;
 import java.util.function.Predicate;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonInclude.Include;
 import com.fasterxml.jackson.annotation.JsonProperty;
@@ -420,6 +421,7 @@ public static class Function {
 			@JsonProperty("parameters")
 			private Map<String, Object> parameters;
 
+			@JsonIgnore
 			private String jsonSchema;
 
 			private Function() {

models/spring-ai-mistral-ai/src/main/java/org/springframework/ai/mistralai/api/MistralAiApi.java

@@ -24,6 +24,7 @@
 import java.util.function.Consumer;
 import java.util.function.Predicate;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonInclude.Include;
 import com.fasterxml.jackson.annotation.JsonProperty;
@@ -390,6 +391,7 @@ public static class Function {
 			@JsonProperty("parameters")
 			private Map<String, Object> parameters;
 
+			@JsonIgnore
 			private String jsonSchema;
 
 			private Function() {

models/spring-ai-openai/src/main/java/org/springframework/ai/openai/api/OpenAiApi.java

@@ -22,6 +22,7 @@
 import java.util.function.Consumer;
 import java.util.function.Predicate;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonInclude.Include;
 import com.fasterxml.jackson.annotation.JsonProperty;
@@ -613,6 +614,7 @@ public static class Function {
 			@JsonProperty("parameters")
 			private Map<String, Object> parameters;
 
+			@JsonIgnore
 			private String jsonSchema;
 
 			private Function() {

models/spring-ai-zhipuai/src/main/java/org/springframework/ai/zhipuai/api/ZhiPuAiApi.java

@@ -24,6 +24,7 @@
 import java.util.function.Consumer;
 import java.util.function.Predicate;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonInclude.Include;
 import com.fasterxml.jackson.annotation.JsonProperty;
@@ -404,6 +405,7 @@ public static class Function {
 			@JsonProperty("parameters")
 			private Map<String, Object> parameters;
 
+			@JsonIgnore
 			private String jsonSchema;
 
 			private Function() {