feat(config): 添加PageableOpenApiCustomizer配置类

新增PageableOpenApiCustomizer配置类，用于自定义OpenAPI的分页参数，确保size参数的最小值为0

src/main/java/com/vxnet/pms/config/PageableOpenApiCustomizer.java

@@ -0,0 +1,29 @@
+package com.vxnet.pms.config;
+
+import java.math.BigDecimal;
+import org.springdoc.core.customizers.OpenApiCustomizer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class PageableOpenApiCustomizer {
+
+    @Bean
+    public OpenApiCustomizer customizePageableOpenApi() {
+        return openApi ->
+            openApi
+                .getPaths()
+                .values()
+                .stream()
+                .flatMap(pathItem -> pathItem.readOperations().stream())
+                .forEach(operation -> {
+                    if (operation.getParameters() != null) {
+                        operation
+                            .getParameters()
+                            .stream()
+                            .filter(parameter -> parameter.getName().equals("size"))
+                            .forEach(parameter -> parameter.getSchema().setMinimum(BigDecimal.ZERO));
+                    }
+                });
+    }
+}