feat: PM项目推进铁律——默认自动推进(暂停才需指令)，加 paused 项目状态 + pause/resume 工具 + PM暂停门控

init/data.json

@@ -3,6 +3,7 @@
         {"parentid": "sd_project_status", "parentname": "项目状态", "items": [
             {"k": "draft", "v": "草稿"},
             {"k": "active", "v": "进行中"},
+            {"k": "paused", "v": "已暂停"},
             {"k": "completed", "v": "已完成"},
             {"k": "archived", "v": "已归档"}
         ]},