Refactor Nginx configuration and update project dependencies

- Cleaned up the Nginx configuration for the Coolify deployment, ensuring proper formatting and organization.
- Updated the `pyproject.toml` file to maintain consistent formatting.
- Reformatted the `requirements.txt` file for better readability while keeping the dependencies unchanged.

backend/requirements-dev.txt

@@ -1,13 +1,13 @@
-# Dev-only dependencies for local development and testing
-# Production dependencies are in requirements.txt
-
-pytest
-pytest-asyncio
-Flask
-gunicorn
-Pygments
-tomli
-exceptiongroup
-iniconfig
-pluggy
-
+# Dev-only dependencies for local development and testing
+# Production dependencies are in requirements.txt
+
+pytest
+pytest-asyncio
+Flask
+gunicorn
+Pygments
+tomli
+exceptiongroup
+iniconfig
+pluggy
+