[Enhancement] Add basic CI pipeline (GitHub Actions) and pytest infrastructure

.github/workflows/python-app.yml

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+name: Python application
+
+on:
+  push:
+    branches: [ "main", "mac-port" ]
+  pull_request:
+    branches: [ "main", "mac-port" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v5
+
+    - name: Set up Python 3.10
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.10"
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install flake8 pytest pytest-flask
+        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+
+    - name: Lint with flake8
+      run: |
+        # stop the build if there are Python syntax errors or undefined names
+        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+
+    - name: Test with pytest
+      env:
+        SECRET_KEY: "test-secret-key"
+      run: |
+        pytest

pytest.ini

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+[pytest]
+pythonpath = API
+testpaths = tests

tests/conftest.py

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+import sys
+import os
+from pathlib import Path
+
+# Add the API folder to sys.path so that 'import app' 
+# and 'from Classes.Base import Config' work exactly as they do in production
+api_path = Path(__file__).parent.parent / "API"
+sys.path.insert(0, str(api_path.resolve()))

tests/test_api_basics.py

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+import pytest
+from API.app import app
+from API.Classes.Base import Config
+
+@pytest.fixture
+def client():
+    # Make sure we don't try to sync to AWS during tests
+    Config.AWS_SYNC = 0
+    app.config['TESTING'] = True
+    app.config['SECRET_KEY'] = 'test-secret-key'
+
+    with app.test_client() as client:
+        yield client
+
+def test_home_page(client):
+    """Test that the application starts and serves the frontend."""
+    # We check /getSession as a basic API liveness probe
+    rv = client.get('/getSession')
+    # Because we haven't set a session, it returns a 200 with session: null
+    assert rv.status_code == 200
+    assert b'session' in rv.data
+
+def test_cors_headers(client):
+    """Test that CORS headers are appended to requests."""
+    rv = client.get('/getSession')
+    assert 'Access-Control-Allow-Origin' in rv.headers
+    assert 'Access-Control-Allow-Credentials' in rv.headers