feat(note): add audio upload and sharing functionality

- Introduced `note_audio` table for storing audio attachments related to notes.
- Implemented audio upload endpoint in `Note` controller to handle audio file uploads.
- Added sharing functionality with `note_share` table to manage share tokens and view counts.
- Updated API routes to include endpoints for audio uploads and share creation.
- Enhanced documentation to reflect new audio and sharing features.

app/note/controller/v1/Share.php

@@ -0,0 +1,51 @@
+<?php
+declare(strict_types=1);
+
+namespace app\note\controller\v1;
+
+use app\api\common\Response;
+use app\note\controller\BaseController;
+use app\note\service\NoteService;
+use think\App;
+
+/**
+ * 笔记分享控制器
+ */
+class Share extends BaseController
+{
+    protected $noteService;
+
+    public function __construct(App $app)
+    {
+        parent::__construct($app);
+        $this->noteService = new NoteService();
+    }
+
+    public function create(int $id)
+    {
+        try {
+            if ($id <= 0) {
+                return Response::error('笔记 ID 不正确', 400);
+            }
+
+            $result = $this->noteService->createShare($this->getCurrentNoteUserId(), $id);
+            return Response::success($result, '分享已生成');
+        } catch (\Throwable $e) {
+            return Response::error($e->getMessage(), $e->getCode() ?: 500);
+        }
+    }
+
+    public function read(string $token)
+    {
+        try {
+            if (trim($token) === '') {
+                return Response::error('分享标识不能为空', 400);
+            }
+
+            $result = $this->noteService->getSharedDetail(trim($token));
+            return Response::success($result);
+        } catch (\Throwable $e) {
+            return Response::error($e->getMessage(), $e->getCode() ?: 500);
+        }
+    }
+}