Fix flake8 F824 in api.py; add FastAPI backend, Streamlit UI, tests, and CI #27

	name: CI

	on:
	push:
	branches: ["main", "master", "copilot/**"]
	pull_request:
	branches: ["main", "master"]

	permissions:
	contents: read

	jobs:
	lint:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4

	- name: Set up Python 3.12
	uses: actions/setup-python@v5
	with:
	python-version: "3.12"
	cache: "pip"

	- name: Install flake8
	run: pip install flake8

	- name: Lint — blocking (syntax errors / undefined names)
	run: flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics

	- name: Lint — style warnings (non-blocking)
	run: flake8 . --count --exit-zero --max-line-length=100 --statistics

	test:
	needs: lint
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.10", "3.11", "3.12"]

	steps:
	- uses: actions/checkout@v4

	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	cache: "pip"

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -r requirements.txt

	- name: Run tests with coverage
	env:
	OPENAI_API_KEY: "offline-mode-no-key-required"
	run: pytest test_chatbot.py -v --tb=short --cov=. --cov-report=xml

	- name: Upload coverage report
	uses: actions/upload-artifact@v4
	with:
	name: coverage-${{ matrix.python-version }}
	path: coverage.xml

	docker-build:
	needs: test
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4

	- name: Build Docker image (web mode)
	run: docker build --build-arg MODE=web -t ai-chatbot:web .

	- name: Build Docker image (api mode)
	run: docker build --build-arg MODE=api -t ai-chatbot:api .

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