fix: replace Python tests with Go and React tests in CI

This is a Go + React project, not Python. Updated CI workflow to:
- Run Go tests (backend)
- Run frontend tests with npm (React)
- Remove Python test coverage requirement

.github/workflows/ci.yml

@@ -37,35 +37,36 @@ jobs:
         run: |
           flake8 . || true
 
-  test-and-coverage:
-    name: Tests & Coverage
+  test-backend:
+    name: Backend Tests (Go)
     runs-on: ubuntu-latest
     needs: [lint]
     steps:
-      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
-      - name: Set up Python
-        uses: actions/setup-python@7f4fc3e22c37d6ff65e88745f38bd3157c663f7c # v4
+      - uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v5
         with:
-          python-version: '3.12'
-      - name: Cache pip
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
+          go-version: '1.22'
+      - name: Run Go tests
+        working-directory: backend
+        run: |
+          go test -v ./...
+
+  test-frontend:
+    name: Frontend Tests (React)
+    runs-on: ubuntu-latest
+    needs: [lint]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
         with:
-          path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements*.txt') }}
-          restore-keys: |
-            ${{ runner.os }}-pip-
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: frontend/package-lock.json
       - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install -r requirements.txt || true
-          pip install -r requirements.dev.txt
-      - name: Run tests with coverage
-        run: |
-          # run pytest under coverage and fail if tests fail
-          coverage run -m pytest -q
-          coverage report -m --fail-under=75
-      - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@b9fd7d16f6d7d1b5d2bec1a2887e65ceed900238 # v4
-        with:
-          fail_ci_if_error: false
-        # Note: Add CODECOV_TOKEN to repo secrets if upload fails or for private repos
+        working-directory: frontend
+        run: npm ci
+      - name: Run frontend tests
+        working-directory: frontend
+        run: npm test