feat: AI 对话附件上下文解析 + 历史会话归档 + 多页面 UI 重构

- 后端: 新增 AttachmentContextBuilder 解析图片/PDF 摘要并拼入 LLM 上下文; ai_chat_endpoints 扩展附件接口; 新增 ReportAnalysisService
- 前端: 新增历史会话页与 conversation_history_provider; chat 链路支持附件展示与回放
- UI: 重构 medication_checkin / notification_center / profile / health_drawer 等多页面
- 配置: api_client baseUrl 适配当前 WiFi IP

health_app/lib/pages/report/report_pages.dart

@@ -2,6 +2,7 @@ import 'dart:convert';
 import 'dart:async';
 import 'dart:io';
 import 'package:dio/dio.dart';
+import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:image_picker/image_picker.dart';
@@ -404,11 +405,12 @@ class ReportListPage extends ConsumerWidget {
           padding: const EdgeInsets.all(16),
           children: [
             EnterpriseHeader(
-              title: '报告管理',
+              title: '报告处理概览',
               subtitle: '上传检查报告后自动进行 AI 结构化解读',
               icon: Icons.description_outlined,
               color: _reportBlue,
               accent: _reportCyan,
+              showIcon: false,
               stats: [
                 EnterpriseStat(
                   label: '报告总数',
@@ -524,6 +526,25 @@ class ReportListPage extends ConsumerWidget {
                   }
                 },
               ),
+              ListTile(
+                leading: const Icon(
+                  Icons.picture_as_pdf_outlined,
+                  color: _reportBlue,
+                ),
+                title: const Text('上传 PDF', style: TextStyle(fontSize: 17)),
+                onTap: () async {
+                  Navigator.pop(ctx);
+                  final result = await FilePicker.platform.pickFiles(
+                    type: FileType.custom,
+                    allowedExtensions: ['pdf'],
+                    withData: false,
+                  );
+                  if (result == null || result.files.isEmpty) return;
+                  final path = result.files.first.path;
+                  if (path == null || path.isEmpty) return;
+                  ref.read(reportProvider.notifier).uploadFile(path);
+                },
+              ),
             ],
           ),
         ),