feat(document): 实现多格式文档上传与解析功能

- 移除 AiChatController 中的 PDF 读取相关逻辑与依赖- 新增 DocumentController 支持文件上传接口
- 新增 DocumentIngestionService 接口及实现，负责文档处理流程
- 抽象 DocumentParser 接口统一各类文档解析器行为
- 重构所有具体文档读取器（PDF、HTML、JSON 等）实现新的解析接口- 引入 MultipartFileResource 工具类以适配 Spring AI 读取器
- 添加 DocumentUploadResponse 响应模型类
- 各文档读取器增加对文件扩展名和 MIME 类型的支持判断

snails-chat/src/main/java/com/hanserwei/chat/controller/AiChatController.java

@@ -2,20 +2,15 @@ package com.hanserwei.chat.controller;
 
 import com.hanserwei.chat.model.dto.ChatMessageDTO;
 import com.hanserwei.chat.model.vo.AIResponse;
-import com.hanserwei.chat.reader.MyPdfReader;
 import com.hanserwei.chat.utils.ConversationContext;
 import jakarta.annotation.Resource;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.ai.chat.client.ChatClient;
 import org.springframework.ai.chat.memory.ChatMemory;
-import org.springframework.ai.document.Document;
-import org.springframework.ai.vectorstore.VectorStore;
 import org.springframework.http.MediaType;
 import org.springframework.web.bind.annotation.*;
 import reactor.core.publisher.Flux;
 
-import java.util.List;
-
 @Slf4j
 @RestController
 @RequestMapping("/ai")
@@ -23,10 +18,6 @@ public class AiChatController {
 
     @Resource
     private ChatClient dashScopeChatClient;
-    @Resource
-    private MyPdfReader myPdfReader;
-    @Resource
-    private VectorStore vectorStore;
 
     @PostMapping(path = "/chat", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
     public Flux<AIResponse> chatWithAi(@RequestBody ChatMessageDTO chatMessageDTO) {
@@ -44,11 +35,4 @@ public class AiChatController {
                 .contextWrite(ctx -> ConversationContext.withConversationId(chatMessageDTO.getConversionId()))
                 .doFinally(signalType -> ConversationContext.clear());
     }
-
-    @GetMapping("/readpdf")
-    public String readPdf() {
-        List<Document> docsFromPdf = myPdfReader.getDocsFromPdf();
-        vectorStore.add(docsFromPdf);
-        return "ok!";
-    }
 }