chore: Setup code formatting and linting

- Add `.editorconfig` for editor consistency.
- Configure GitHub Actions workflow for linting (`.github/workflows/lint.yml`).
- Add pre-commit hooks for automated checks (`.pre-commit-config.yaml`).
- Configure Prettier and exclusions (`.prettierrc.yaml`, `.prettierignore`).
- Update VS Code extensions to include formatting tools (`.vscode/extensions.json`).
- Adjust VS Code settings for auto-formatting (`.vscode/settings.json`).

.github/workflows/lint.yml

@@ -0,0 +1,40 @@
+name: Lint & Format Check
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+jobs:
+  lint:
+    name: Lint & Format
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: 20
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.11
+
+      - run: pip install uv
+      - run: uv sync
+
+      # Python checks (isort, black, ruff, mypy)
+      - run: uv run isort --check-only .
+      - run: uv run black --check .
+      - run: uv run ruff check --ignore E501,E402 .
+      - run: uv run mypy .
+
+      # JS/TS/Markdown/YAML checks
+      - run: uv run prettier --check "**/*.{ts,tsx,js,jsx,json,md,yaml,yml}"