fix: Remove legacy Python lint job from CI workflow

- Remove ruff/flake8/pre-commit steps (legacy Python scaffold)
- Remove needs dependencies on non-existent lint job
- Backend and frontend tests now run independently

.github/workflows/ci.yml

@@ -7,47 +7,15 @@ on:
     branches: [ main, development ]
 
 jobs:
-  lint:
-    name: Lint (ruff & flake8)
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
-      - name: Set up Python
-        uses: actions/setup-python@7f4fc3e22c37d6ff65e88745f38bd3157c663f7c # v4
-        with:
-          python-version: '3.12'
-      - name: Cache pip
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
-        with:
-          path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements*.txt') }}
-          restore-keys: |
-            ${{ runner.os }}-pip-
-      - name: Install dev dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install -r requirements.dev.txt
-      - name: Run pre-commit
-        run: |
-          pre-commit run --all-files
-      - name: Run ruff
-        run: |
-          ruff check .
-      - name: Run flake8
-        run: |
-          flake8 . || true
-
   test-backend:
     name: Backend Tests (Go)
     runs-on: ubuntu-latest
-    needs: [lint]
     steps:
       - uses: actions/checkout@v4
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
           go-version: '1.22'
-          cache-dependency-path: backend/go.sum
       - name: Run Go tests
         working-directory: backend
         run: |
@@ -56,7 +24,6 @@ jobs:
   test-frontend:
     name: Frontend Tests (React)
     runs-on: ubuntu-latest
-    needs: [lint]
     steps:
       - uses: actions/checkout@v4
       - name: Set up Node.js