feat(pc): 添加景区项目管理功能

- 新增项目管理相关的 Controller、Service、Mapper 及模型类
- 实现项目分页查询、列表查询、详情查询、新增、修改、删除等功能
- 添加项目状态更新和二维码下载功能
- 集成微信小程序二维码生成和存储服务

src/main/resources/mapper/ProjectMapper.xml

@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.ycwl.basic.mapper.ProjectMapper">
+    <insert id="add">
+        insert into project(scenic_id, `name`, min_play_time, max_play_time, status, create_at, update_at) 
+        values (#{scenicId}, #{name}, #{minPlayTime}, #{maxPlayTime}, #{status}, now(), now())
+    </insert>
+    
+    <update id="update">
+        update project set 
+            `name` = #{name}, 
+            min_play_time = #{minPlayTime}, 
+            max_play_time = #{maxPlayTime}, 
+            status = #{status}, 
+            update_at = now() 
+        where id = #{id}
+    </update>
+    
+    <update id="updateStatus">
+        update project
+        set status = (CASE
+            status
+                          WHEN 1 THEN
+                              0
+                          WHEN 0 THEN
+                              1
+                          ELSE 1
+            END),
+            update_at = now()
+        where id = #{id}
+    </update>
+    
+    <delete id="deleteById">
+        delete from project where id = #{id}
+    </delete>
+    
+    <select id="list" resultType="com.ycwl.basic.model.pc.project.resp.ProjectRespVO">
+        select p.id, p.scenic_id, p.`name`, p.min_play_time, p.max_play_time, p.status, p.create_at, p.update_at
+        from project p
+        <where>
+            <if test="scenicId != null">
+                and p.scenic_id = #{scenicId}
+            </if>
+            <if test="name != null and name != ''">
+                and p.`name` like concat('%', #{name}, '%')
+            </if>
+            <if test="status != null">
+                and p.`status` = #{status}
+            </if>
+        </where>
+        order by p.create_at desc
+    </select>
+    
+    <select id="getById" resultType="com.ycwl.basic.model.pc.project.resp.ProjectRespVO">
+        select p.id, p.scenic_id, p.`name`, p.min_play_time, p.max_play_time, p.status, p.create_at, p.update_at
+        from project p
+        where p.id = #{id}
+    </select>
+</mapper>