feat: 完成配置中心重构和命名规范优化

- 重构config层为配置中心架构，支持动态配置管理
- 统一core层命名规范(event-bus→event, circuit-breaker→breaker, domain-sdk→sdk)
- 修复数据库连接配置路径问题
- 实现配置中心完整功能：系统配置、动态配置、配置验证、统计
- 优化目录结构，为微服务架构做准备
- 修复TypeScript编译错误和依赖注入问题

wwjcloud/src/config/services/dynamicConfigService.ts

@@ -0,0 +1,145 @@
+import { Injectable, Logger } from '@nestjs/common';
+
+export interface DynamicConfig {
+  key: string;
+  value: any;
+  description?: string;
+  type?: 'string' | 'number' | 'boolean' | 'json';
+  category?: string;
+  isPublic?: boolean;
+  createdAt?: Date;
+  updatedAt?: Date;
+}
+
+@Injectable()
+export class DynamicConfigService {
+  private readonly logger = new Logger(DynamicConfigService.name);
+  private readonly configs = new Map<string, DynamicConfig>();
+
+  constructor() {
+    // 初始化一些默认配置
+    this.initializeDefaultConfigs();
+  }
+
+  private initializeDefaultConfigs() {
+    const defaultConfigs: DynamicConfig[] = [
+      {
+        key: 'system.maintenance',
+        value: false,
+        description: '系统维护模式',
+        type: 'boolean',
+        category: 'system',
+        isPublic: true,
+        createdAt: new Date(),
+        updatedAt: new Date(),
+      },
+      {
+        key: 'system.debug',
+        value: process.env.NODE_ENV === 'development',
+        description: '调试模式',
+        type: 'boolean',
+        category: 'system',
+        isPublic: false,
+        createdAt: new Date(),
+        updatedAt: new Date(),
+      },
+    ];
+
+    defaultConfigs.forEach(config => {
+      this.configs.set(config.key, config);
+    });
+  }
+
+  /**
+   * 获取配置
+   */
+  async getConfig(key: string): Promise<DynamicConfig | null> {
+    return this.configs.get(key) || null;
+  }
+
+  /**
+   * 获取配置列表
+   */
+  async getConfigList(category?: string): Promise<DynamicConfig[]> {
+    const configs = Array.from(this.configs.values());
+    
+    if (category) {
+      return configs.filter(config => config.category === category);
+    }
+    
+    return configs;
+  }
+
+  /**
+   * 设置配置
+   */
+  async setConfig(
+    key: string,
+    value: any,
+    options: {
+      description?: string;
+      type?: 'string' | 'number' | 'boolean' | 'json';
+      category?: string;
+      isPublic?: boolean;
+    } = {}
+  ): Promise<void> {
+    const existingConfig = this.configs.get(key);
+    const now = new Date();
+
+    const config: DynamicConfig = {
+      key,
+      value,
+      description: options.description || existingConfig?.description,
+      type: options.type || this.inferType(value) || existingConfig?.type || 'string',
+      category: options.category || existingConfig?.category || 'general',
+      isPublic: options.isPublic !== undefined ? options.isPublic : existingConfig?.isPublic ?? true,
+      createdAt: existingConfig?.createdAt || now,
+      updatedAt: now,
+    };
+
+    this.configs.set(key, config);
+    this.logger.log(`动态配置已更新: ${key} = ${value}`);
+  }
+
+  /**
+   * 删除配置
+   */
+  async deleteConfig(key: string): Promise<void> {
+    if (this.configs.has(key)) {
+      this.configs.delete(key);
+      this.logger.log(`动态配置已删除: ${key}`);
+    }
+  }
+
+  /**
+   * 推断值类型
+   */
+  private inferType(value: any): 'string' | 'number' | 'boolean' | 'json' {
+    if (typeof value === 'string') return 'string';
+    if (typeof value === 'number') return 'number';
+    if (typeof value === 'boolean') return 'boolean';
+    if (typeof value === 'object') return 'json';
+    return 'string';
+  }
+
+  /**
+   * 获取配置统计
+   */
+  async getConfigStats() {
+    const configs = Array.from(this.configs.values());
+    const categories = [...new Set(configs.map(c => c.category))];
+    
+    return {
+      total: configs.length,
+      categories: categories.length,
+      public: configs.filter(c => c.isPublic).length,
+      private: configs.filter(c => !c.isPublic).length,
+      byCategory: categories.reduce((acc, category) => {
+        if (category) {
+          acc[category] = configs.filter(c => c.category === category).length;
+        }
+        return acc;
+      }, {} as Record<string, number>),
+    };
+  }
+}