fix: 添加缺失的 Project Board API swagger 响应定义

修复 CI lint-swagger 失败的问题:
- 添加 routers/api/v1/swagger/project.go
- 包含 Project, ProjectList, ProjectColumn, ProjectColumnList 响应定义

Related: #36008

Author: SupenBysz

routers/api/v1/swagger/project.go

@@ -0,0 +1,36 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package swagger
+
+import (
+	api "code.gitea.io/gitea/modules/structs"
+)
+
+// Project
+// swagger:response Project
+type swaggerResponseProject struct {
+	// in:body
+	Body api.Project `json:"body"`
+}
+
+// ProjectList
+// swagger:response ProjectList
+type swaggerResponseProjectList struct {
+	// in:body
+	Body []api.Project `json:"body"`
+}
+
+// ProjectColumn
+// swagger:response ProjectColumn
+type swaggerResponseProjectColumn struct {
+	// in:body
+	Body api.ProjectColumn `json:"body"`
+}
+
+// ProjectColumnList
+// swagger:response ProjectColumnList
+type swaggerResponseProjectColumnList struct {
+	// in:body
+	Body []api.ProjectColumn `json:"body"`
+}