feat: add GPU-specific fields to marketplace offers and create dedicated GPU marketplace router

- Add GPU fields (model, memory, count, CUDA version, price, region) to MarketplaceOffer model
- Create new marketplace_gpu router for GPU-specific operations
- Update offer sync to populate GPU fields from miner capabilities
- Move GPU attributes from generic attributes dict to dedicated fields
- Update MarketplaceOfferView schema with GPU fields
- Expand CLI README with comprehensive documentation and

.github/workflows/cli-tests.yml

@@ -0,0 +1,50 @@
+name: CLI Tests
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'cli/**'
+      - 'tests/cli/**'
+  pull_request:
+    branches: [main]
+    paths:
+      - 'cli/**'
+      - 'tests/cli/**'
+
+jobs:
+  test:
+    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 }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e .
+          pip install pytest pytest-cov
+
+      - name: Run CLI tests
+        run: |
+          python -m pytest tests/cli/ -v --tb=short --disable-warnings
+
+      - name: Run CLI tests with coverage
+        if: matrix.python-version == '3.11'
+        run: |
+          python -m pytest tests/cli/ --cov=aitbc_cli --cov-report=term-missing --cov-report=xml
+
+      - name: Upload coverage
+        if: matrix.python-version == '3.11'
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-report
+          path: coverage.xml