Update: 将子项目从 submodule 转为完整内容

- 移除 GovAI, nomifun-tauri, 算力盒子 的 submodule 引用
- 添加所有子项目的完整源代码
- 保留原始 .git 为 .git.bak 备份

nomifun-tauri/crates/backend/nomifun-requirement/src/convert.rs

@@ -0,0 +1,24 @@
+use nomifun_api_types::{Requirement, RequirementStatus};
+use nomifun_db::models::RequirementRow;
+
+/// Map a DB row to the API response object.
+pub fn row_to_dto(row: &RequirementRow) -> Requirement {
+    Requirement {
+        id: row.id.clone(),
+        title: row.title.clone(),
+        content: row.content.clone(),
+        tag: row.tag.clone(),
+        order_key: row.order_key.clone(),
+        status: RequirementStatus::from_db(&row.status),
+        completion_note: row.completion_note.clone(),
+        owner_session_id: row.owner_session_id.clone(),
+        owner_kind: row.owner_kind.clone(),
+        started_at: row.started_at,
+        completed_at: row.completed_at,
+        attempt_count: row.attempt_count,
+        created_by: row.created_by.clone(),
+        created_at: row.created_at,
+        updated_at: row.updated_at,
+        attachments: Vec::new(),
+    }
+}