docs: Day 12-13 completion summary and milestone update

backend/src/adapters/LLMFactory.ts

@@ -0,0 +1,77 @@
+import { ILLMAdapter, ModelType } from './types.js';
+import { DeepSeekAdapter } from './DeepSeekAdapter.js';
+import { QwenAdapter } from './QwenAdapter.js';
+
+/**
+ * LLM工厂类
+ * 根据模型类型创建相应的适配器实例
+ */
+export class LLMFactory {
+  private static adapters: Map<string, ILLMAdapter> = new Map();
+
+  /**
+   * 获取LLM适配器实例（单例模式）
+   * @param modelType 模型类型
+   * @returns LLM适配器实例
+   */
+  static getAdapter(modelType: ModelType): ILLMAdapter {
+    // 如果已经创建过该适配器，直接返回
+    if (this.adapters.has(modelType)) {
+      return this.adapters.get(modelType)!;
+    }
+
+    // 根据模型类型创建适配器
+    let adapter: ILLMAdapter;
+
+    switch (modelType) {
+      case 'deepseek-v3':
+        adapter = new DeepSeekAdapter('deepseek-chat');
+        break;
+
+      case 'qwen3-72b':
+        adapter = new QwenAdapter('qwen-max'); // Qwen3-72B对应的模型名
+        break;
+
+      case 'gemini-pro':
+        // TODO: 实现Gemini适配器
+        throw new Error('Gemini adapter is not implemented yet');
+
+      default:
+        throw new Error(`Unsupported model type: ${modelType}`);
+    }
+
+    // 缓存适配器实例
+    this.adapters.set(modelType, adapter);
+    return adapter;
+  }
+
+  /**
+   * 清除适配器缓存
+   * @param modelType 可选，指定清除某个模型的适配器，不传则清除所有
+   */
+  static clearCache(modelType?: ModelType): void {
+    if (modelType) {
+      this.adapters.delete(modelType);
+    } else {
+      this.adapters.clear();
+    }
+  }
+
+  /**
+   * 检查模型是否支持
+   * @param modelType 模型类型
+   * @returns 是否支持
+   */
+  static isSupported(modelType: string): boolean {
+    return ['deepseek-v3', 'qwen3-72b', 'gemini-pro'].includes(modelType);
+  }
+
+  /**
+   * 获取所有支持的模型列表
+   * @returns 支持的模型列表
+   */
+  static getSupportedModels(): ModelType[] {
+    return ['deepseek-v3', 'qwen3-72b', 'gemini-pro'];
+  }
+}
+