feat(project): 项目编号支持新增编辑自由填写

项目管理弹窗增加项目编号输入；后端保存改为接收客户端编号并校验租户内唯一，不再自动生成。

Co-authored-by: Cursor <cursoragent@cursor.com>

web-admin/src/views/project-management/ManagementPage.vue

@@ -149,6 +149,13 @@
                 v-else
                 v-model="form.projectName"
             /></el-form-item>
+            <el-form-item
+              v-if="!isTeam"
+              label="项目编号"
+              prop="projectNo"
+              :rules="[{ required: true, message: '请输入项目编号' }]"
+              ><el-input v-model="form.projectNo" maxlength="64" show-word-limit
+            /></el-form-item>
             <el-form-item
               v-if="!isTeam"
               label="所属项目组"
@@ -356,6 +363,7 @@
       : {
           teamName: '',
           projectName: '',
+          projectNo: '',
           leaderUserId: '',
           enabled: true,
           status: 'pending',