chore: remove obsolete CI workflows and add new publish workflow

.github/workflows/validation.yml

@@ -0,0 +1,91 @@
+name: validation
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+env:
+  PYTHON_VERSION: '>=3.10'
+
+jobs:
+  lint:
+    name: Code Quality (Ruff & Mypy)
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{env.PYTHON_VERSION}}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install ruff mypy
+
+      - name: Run Ruff linter
+        run: |
+          ruff check src/
+          echo "✅ Ruff checks passed!"
+
+      - name: Run Mypy type checker
+        run: |
+          mypy src/
+          echo "✅ Mypy checks passed!"
+        continue-on-error: true  # Don't fail CI on mypy errors yet
+
+  validate:
+    name: Validate Language Files
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{env.PYTHON_VERSION}}
+
+      - name: Validate language files
+        run: |
+          failed=()
+          for file in "lang/"*.json; do
+            if err="$(python -m json.tool "${file}" 2>&1 >/dev/null)"; then
+              echo "[OK] ${file}"
+            else
+              echo "[ERROR] ${file} ${err}"
+              failed+=("${file}")
+            fi
+          done
+          if [ "${#failed[@]}" -gt 0 ]; then
+            echo -e "\nFailed to validate the following language file(s): ${failed[@]}"
+            exit 1
+          fi
+
+  docker:
+    name: Docker Build Validation
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    needs: [lint, validate]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: false
+          cache-from: type=gha
+          cache-to: type=gha,mode=max