feat(api): 初始化笔记应用后端基础架构

- 添加环境配置文件 .env.example 包含数据库、JWT、CORS等配置
- 创建 .gitignore 文件忽略敏感文件和临时文件
- 配置 Apache 重写规则支持路由转发
- 实现 JWT 认证中间件提供用户身份验证功能
- 添加 MySQL 数据库初始化脚本包含分组、图片、笔记表结构

biji-php/src/Models/Grouping.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace App\Models;
+
+use App\Utils\Database;
+use PDO;
+
+class Grouping
+{
+    private $db;
+
+    public function __construct()
+    {
+        $this->db = Database::getInstance()->getConnection();
+    }
+
+    public function getAll($parentId = null)
+    {
+        if ($parentId === null) {
+            $stmt = $this->db->prepare("SELECT * FROM `grouping` WHERE is_deleted = 0 ORDER BY id");
+        } else {
+            $stmt = $this->db->prepare("SELECT * FROM `grouping` WHERE parentId = ? AND is_deleted = 0 ORDER BY id");
+            $stmt->execute([$parentId]);
+            return $stmt->fetchAll();
+        }
+        $stmt->execute();
+        return $stmt->fetchAll();
+    }
+
+    public function findById($id)
+    {
+        $stmt = $this->db->prepare("SELECT * FROM `grouping` WHERE id = ? AND is_deleted = 0");
+        $stmt->execute([$id]);
+        return $stmt->fetch();
+    }
+
+    public function create($grouping, $parentId = 0)
+    {
+        $stmt = $this->db->prepare("INSERT INTO `grouping` (`grouping`, parentId) VALUES (?, ?)");
+        $stmt->execute([$grouping, $parentId]);
+        return $this->db->lastInsertId();
+    }
+
+    public function update($id, $grouping)
+    {
+        $stmt = $this->db->prepare("UPDATE `grouping` SET `grouping` = ? WHERE id = ?");
+        return $stmt->execute([$grouping, $id]);
+    }
+
+    public function softDelete($id, $userId)
+    {
+        $stmt = $this->db->prepare(
+            "UPDATE `grouping` SET is_deleted = 1, deleted_at = NOW(), deleted_by = ? WHERE id = ?"
+        );
+        return $stmt->execute([$userId, $id]);
+    }
+}