[bot] Update repository structure and Mermaid diagram

Author: github-actions[bot]

MERMAID_DIAGRAM.md

@@ -6,19 +6,13 @@ graph TD
     subgraph graph_git_repo
         root[graph-git-repo]
         root --> gitignore[.gitignore]
-        root --> license[LICENSE]
-        root --> mermaid[MERMAID_DIAGRAM.md]
+        root --> LICENSE[LICENSE]
+        root --> MERMAID_DIAGRAM[MERMAID_DIAGRAM.md]
         root --> README[README.md]
-        root --> repo_structure[REPO_STRUCTURE.md]
+        root --> REPO_STRUCTURE[REPO_STRUCTURE.md]
+        root --> action[action.yml]
         root --> base[base.sh]
         root --> tree_to_gpt[tree_to_gpt.py]
     end
     style graph_git_repo fill:#e0f7fa,stroke:#333,stroke-width:2px;
-    style gitignore fill:#ffccbc,stroke:#333,stroke-width:1px;
-    style license fill:#ffccbc,stroke:#333,stroke-width:1px;
-    style mermaid fill:#ffccbc,stroke:#333,stroke-width:1px;
-    style README fill:#ffccbc,stroke:#333,stroke-width:1px;
-    style repo_structure fill:#ffccbc,stroke:#333,stroke-width:1px;
-    style base fill:#ffccbc,stroke:#333,stroke-width:1px;
-    style tree_to_gpt fill:#ffccbc,stroke:#333,stroke-width:1px;
 ```

REPO_STRUCTURE.md

@@ -6,6 +6,7 @@ graph-git-repo
 ├── MERMAID_DIAGRAM.md
 ├── README.md
 ├── REPO_STRUCTURE.md
+├── action.yml
 ├── base.sh
 └── tree_to_gpt.py
 ```