Add /n/ short link alias and simplify CI lint job

- Add /n/{public_key} route as alias for /nodes/{public_key} for shorter URLs
- Replace individual lint tools in CI with pre-commit/action for consistency

.github/workflows/ci.yml

@@ -18,20 +18,8 @@ jobs:
         with:
           python-version: "3.13"
 
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install black flake8 mypy
-          pip install -e ".[dev]"
-
-      - name: Check formatting with black
-        run: black --check src/ tests/
-
-      - name: Lint with flake8
-        run: flake8 src/ tests/
-
-      - name: Type check with mypy
-        run: mypy src/
+      - name: Run pre-commit
+        uses: pre-commit/action@v3.0.1
 
   test:
     name: Test (Python ${{ matrix.python-version }})