Update project configuration and code structure

- Added '*.o' to .gitignore to exclude object files from version control.
- Modified Dockerfile to specify the application directory for Uvicorn.
- Updated setup.py to reflect the new source directory structure for Cython extensions.
- Adjusted E2E Docker Compose command to include the application directory.
- Refined type hints in ApiClient and Security classes for better clarity and consistency.

These changes enhance the project's organization and improve the build process.

setup.py

@@ -2,13 +2,13 @@ from setuptools import setup, Extension
 from Cython.Build import cythonize
 
 extensions = [
-    Extension('constants', ['constants.pyx']),
-    Extension('credentials', ['credentials.pyx']),
-    Extension('user', ['user.pyx']),
-    Extension('security', ['security.pyx']),
-    Extension('hardware_service', ['hardware_service.pyx']),
-    Extension('cdn_manager', ['cdn_manager.pyx']),
-    Extension('api_client', ['api_client.pyx']),
+    Extension('constants', ['src/constants.pyx']),
+    Extension('credentials', ['src/credentials.pyx']),
+    Extension('user', ['src/user.pyx']),
+    Extension('security', ['src/security.pyx']),
+    Extension('hardware_service', ['src/hardware_service.pyx']),
+    Extension('cdn_manager', ['src/cdn_manager.pyx']),
+    Extension('api_client', ['src/api_client.pyx']),
 ]
 
 setup(