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/config/database.php

@@ -0,0 +1,15 @@
+<?php
+
+return [
+    'host' => $_ENV['DB_HOST'] ?? 'localhost',
+    'port' => $_ENV['DB_PORT'] ?? '3306',
+    'database' => $_ENV['DB_NAME'] ?? 'biji_db',
+    'username' => $_ENV['DB_USER'] ?? 'root',
+    'password' => $_ENV['DB_PASS'] ?? '',
+    'charset' => 'utf8mb4',
+    'options' => [
+        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+        PDO::ATTR_EMULATE_PREPARES => false,
+    ]
+];

biji-php/config/routes.php

@@ -0,0 +1,62 @@
+<?php
+
+use Slim\Routing\RouteCollectorProxy;
+use App\Controllers\UserController;
+use App\Controllers\MarkdownController;
+use App\Controllers\GroupingController;
+use App\Middleware\AuthMiddleware;
+
+// 根路径测试路由
+$app->get('/', function ($request, $response) {
+    $data = [
+        'status' => 'success',
+        'message' => 'Biji PHP API is running',
+        'version' => '1.0.0',
+        'endpoints' => [
+            'POST /api/user/register' => '用户注册',
+            'POST /api/user/login' => '用户登录',
+            'GET /api/markdown' => '获取所有笔记',
+            'GET /api/markdown/{id}' => '获取单个笔记',
+            'GET /api/groupings' => '获取分组列表'
+        ]
+    ];
+    $response->getBody()->write(json_encode($data, JSON_UNESCAPED_UNICODE));
+    return $response->withHeader('Content-Type', 'application/json');
+});
+
+// 用户相关路由（无需认证）
+$app->group('/api/user', function (RouteCollectorProxy $group) {
+    $group->post('/register', [UserController::class, 'register']);
+    $group->post('/login', [UserController::class, 'login']);
+});
+
+// 用户相关路由（需要认证）
+$app->group('/api/user', function (RouteCollectorProxy $group) {
+    $group->post('/validate-token', [UserController::class, 'validateToken']);
+    $group->put('/password', [UserController::class, 'updatePassword']);
+    $group->delete('/deleteUser', [UserController::class, 'deleteUser']);
+})->add(new AuthMiddleware());
+
+// Markdown 相关路由
+$app->group('/api/markdown', function (RouteCollectorProxy $group) {
+    $group->get('/{id}', [MarkdownController::class, 'getById']);
+    $group->get('', [MarkdownController::class, 'getAll']);
+});
+
+// Markdown 相关路由（需要认证）
+$app->group('/api/markdown', function (RouteCollectorProxy $group) {
+    $group->post('/updateMarkdown', [MarkdownController::class, 'update']);
+    $group->delete('/{id}', [MarkdownController::class, 'delete']);
+})->add(new AuthMiddleware());
+
+// 分组相关路由（无需认证）
+$app->group('/api/groupings', function (RouteCollectorProxy $group) {
+    $group->get('', [GroupingController::class, 'getAll']);
+});
+
+// 分组相关路由（需要认证）
+$app->group('/api/groupings', function (RouteCollectorProxy $group) {
+    $group->post('', [GroupingController::class, 'create']);
+    $group->put('/{id}', [GroupingController::class, 'update']);
+    $group->delete('/{id}', [GroupingController::class, 'delete']);
+})->add(new AuthMiddleware());