ci(workflow): Update trigger paths to reflect project refactoring

The project's file structure has been reorganized. This commit updates the `paths` filter in the main GitHub Actions workflow to align with the new layout.

The old paths (`main.py`, `utils.py`, `core/`) have been replaced with the new source directories (`bot.py`, `config.py`, `aient/`, `md2tgmd/`, `utils/`). Additionally, `.gitignore` has been added to the trigger paths.

This change ensures the CI pipeline runs only when relevant project files are modified.

Author: yym68686

.github/workflows/main.yml

@@ -6,12 +6,14 @@ on:
     branches:
       - main
     paths:
-      - main.py
-      - utils.py
-      - core/**
-      - core
+      - bot.py
+      - config.py
+      - aient/**
+      - md2tgmd/**
+      - utils/**
       - Dockerfile
       - .dockerignore
+      - .gitignore
       - pyproject.toml
       - docker-compose.yml
       - .github/workflows/main.yml