feat(skills): 技能管理 - 增加可选的平台子分类策展 (#693)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

.gitignore

@@ -18,6 +18,7 @@ docs/content/docs/plugins/*
 # Keep the task stability runbook versioned without unignoring generated docs.
 !docs/content/docs/backend/
 docs/content/docs/backend/*
+!docs/content/docs/backend/skill-curation.mdx
 !docs/content/docs/backend/task-runtime-stability.mdx
 !docs/content/docs/backend/agent-prompt-policy.mdx
 !docs/content/docs/backend/canvas-agent-appearance.mdx
@@ -76,4 +77,4 @@ backend/cmd/server/server
 backend/tmp_*
 # Keep the runtime in source control; its optional debug map is not deployed.
 /web/public/live2d/live2dcubismcore.min.js.map
-.zocde/
+.zocde/