Enhance AI_ChatBot to modern competitive standards

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: ["main", "master", "copilot/**"]
+  pull_request:
+    branches: ["main", "master"]
+
+# Restrict default GITHUB_TOKEN permissions to read-only
+permissions:
+  contents: read
+
+jobs:
+  lint-and-test:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+
+      - name: Lint with flake8
+        run: |
+          pip install flake8
+          # Stop the build if there are Python syntax errors or undefined names
+          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+          # Treat all other issues as warnings (non-blocking)
+          flake8 . --count --exit-zero --max-line-length=100 --statistics
+
+      - name: Run tests
+        run: pytest test_chatbot.py -v
+
+  docker-build:
+    runs-on: ubuntu-latest
+    needs: lint-and-test
+    permissions:
+      contents: read
+
+    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 .

.gitignore

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+# Python cache
+__pycache__/
+*.py[cod]
+
+# Virtual environment
+venv/
+.venv/
+
+# Jupyter/IPython
+.ipynb_checkpoints/
+
+# System files
+.DS_Store
+Thumbs.db
+
+# IDE settings
+.vscode/
+.idea/
+
+# Environment / secrets
+.env
+
+# Pytest cache
+.pytest_cache/
+
+# Temporary / generated files
+converted_dialog.csv

Dockerfile

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+FROM python:3.12-slim
+
+# Build arguments to select the runtime mode:
+#   web  → run the Streamlit web demo  (default)
+#   api  → run the FastAPI REST backend
+ARG MODE=web
+
+WORKDIR /app
+
+# Install dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy source
+COPY . .
+
+# Expose ports
+#   8501 → Streamlit
+#   8000 → FastAPI / uvicorn
+EXPOSE 8501 8000
+
+ENV MODE=${MODE}
+
+CMD ["sh", "-c", "\
+  if [ \"$MODE\" = 'api' ]; then \
+    uvicorn api:app --host 0.0.0.0 --port 8000; \
+  else \
+    streamlit run web_demo.py --server.port 8501 --server.address 0.0.0.0; \
+  fi"]