ci: set up GitHub Actions workflow and requirements.txt for automated…

.github/workflows/ci.yml

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+name: Philea CI Pipeline
+
+on:
+  push:
+    branches: [ main, dev ]
+  pull_request:
+    branches: [ main, dev ]
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout Code
+      uses: actions/checkout@v4
+
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.12'
+        cache: 'pip'
+
+    - name: Install Dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+
+    - name: Run Linter (Flake8)
+      run: |
+        # Stop the build if there are Python syntax errors or undefined names
+        flake8 src/ --count --select=E9,F63,F7,F82 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        flake8 src/ --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+
+    - name: Syntax Compile Check (Build)
+      run: |
+        python -m compileall src/
+
+    - name: Run Unit Tests
+      env:
+        GEMINI_API_KEY: "dummy_key"
+      run: |
+        PYTHONPATH=src python -m unittest discover -s src/tests

requirements.txt

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+requests>=2.31.0
+beautifulsoup4>=4.12.0
+google-genai>=2.0.0
+pydantic>=2.0.0
+flake8>=7.0.0