feat: add project infrastructure

- Add src/ structure with config and logger modules
- Add .env.example with required environment variables
- Add python-dotenv dependency
- Add TASK.md with implementation roadmap

pyproject.toml

@@ -5,5 +5,6 @@ description = "Add your description here"
 readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
+    "python-dotenv>=1.2.1",
     "python-telegram-bot>=22.6",
 ]