chore: 清理 .gitignore + 添加 wiki/permissions.md

1. .gitignore: 补充临时调试文件(_*.txt/server_*.txt/tmp_*.txt 等)、
   graphify-out/、apps/mp-native/ 的忽略规则
2. wiki/permissions.md: 角色权限体系文档

.gitignore

@@ -82,6 +82,28 @@ tmp/
 screenshots/
 server-log.txt
 snapshot_*.txt
+_*.txt
+_server_*.txt
+tmp_*.txt
+direct_*.txt
+server_*.txt
+server_combined.txt
+out.txt
+_wx_login.json
+.claude/settings.json
+
+# Trace/debug JSON
+trace-*.json
+
+# Graphify knowledge graph (regenerated locally)
+graphify-out/
+
+# Native miniprogram (separate project)
+apps/mp-native/
+
+# Misc untracked
+err.txt
 uploads/g:/hms/.superpowers/
 .claude/skills/design-handoff/node_modules/
 .design/config.yml
+.superpowers/