重构项目结构：迁移到单体架构并优化代码组织

- 删除分布式架构相关文件和配置
- 将backend-distributed重命名为backend保留分布式代码作为参考
- 优化backend-single单体架构实现
- 添加Coze API集成相关文档和测试
- 清理项目根目录的部署脚本和配置文件
- 更新WebSocket和消息服务实现
- 完善认证服务和密码加密功能

backend/emotion-gateway/src/main/java/com/emotionmuseum/gateway/GatewayApplication.java

@@ -0,0 +1,20 @@
+package com.emotionmuseum.gateway;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
+
+/**
+ * 网关服务启动类
+ *
+ * @author emotion-museum
+ * @since 2025-07-12
+ */
+@SpringBootApplication
+@EnableDiscoveryClient
+public class GatewayApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(GatewayApplication.class, args);
+    }
+}

backend/emotion-gateway/src/main/java/com/emotionmuseum/gateway/config/CorsConfig.java

@@ -0,0 +1,39 @@
+package com.emotionmuseum.gateway.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.cors.CorsConfiguration;
+import org.springframework.web.cors.reactive.CorsWebFilter;
+import org.springframework.web.cors.reactive.UrlBasedCorsConfigurationSource;
+
+/**
+ * CORS配置
+ */
+@Configuration
+public class CorsConfig {
+
+    @Bean
+    public CorsWebFilter corsWebFilter() {
+        CorsConfiguration corsConfiguration = new CorsConfiguration();
+        
+        // 允许所有来源
+        corsConfiguration.addAllowedOriginPattern("*");
+        
+        // 允许所有请求头
+        corsConfiguration.addAllowedHeader("*");
+        
+        // 允许所有请求方法
+        corsConfiguration.addAllowedMethod("*");
+        
+        // 不允许携带凭证（这样就可以使用 * 作为来源）
+        corsConfiguration.setAllowCredentials(false);
+        
+        // 预检请求的缓存时间
+        corsConfiguration.setMaxAge(3600L);
+        
+        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
+        source.registerCorsConfiguration("/**", corsConfiguration);
+        
+        return new CorsWebFilter(source);
+    }
+}