ci: Migrate from Flake8/Black/isort to Ruff

- Drop legacy Python quality tools from CI.
- Implement Ruff-based validation workflow.

Author: RandomProgramm3r

.github/workflows/linting.yml

@@ -1,38 +1,27 @@
 name: Linting
-
 on:
   push:
     branches: [main]
   pull_request:
     branches: [main]
+  workflow_dispatch:
 
 jobs:
   lint:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        tool: [black, isort, flake8]
-      max-parallel: 3
-      fail-fast: false
+        python-version: ["3.13"]
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
+      - name: Checkout repository
+        uses: actions/checkout@v3
 
-      - name: Set up Python with caching
-        uses: actions/setup-python@v5
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
         with:
-          python-version: '3.13'
-          cache: 'pip'
-
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install -r requirements/dev.txt
+          python-version: ${{ matrix.python-version }}
 
-      - name: Run ${{ matrix.tool }}
-        shell: bash
-        env:
-          TOOL: ${{ matrix.tool }}
-        run: |
-          $TOOL --version
-          $TOOL . --check --verbose
+      - name: Run Ruff via Action
+        uses: astral-sh/ruff-action@v3.2.2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}