Add gitea-repo-sync skill

gitea-repo-sync/agents/openai.yaml

@@ -0,0 +1,4 @@
+interface:
+  display_name: "Gitea Repo Sync"
+  short_description: "Create Gitea repositories and sync local projects safely"
+  default_prompt: "Create or reuse a Gitea repository, initialize the current project as git if needed, configure a safe remote, and push the requested branches or tags without storing the token in the remote URL."