feat: 添加 Analytics 分析功能（行为追踪、错误码、协议更新）

.gitignore

@@ -295,6 +295,7 @@ deploy/.env.prod
 .history
 /logs/
 backend/logs/
+backend/data/analytics/
 *.tar.gz
 *.tar
 # Docker volumes (local data)
@@ -307,6 +308,9 @@ infra/docker/supabase/volumes/storage/
 # .opencode/ is now tracked - see .opencode/.gitignore for exclusions
 .opencode/opencode.json.old
 
+# Agents and skills
+.agents/
+
 # Local git worktrees
 .worktrees/
 worktrees/