fix: add pre-commit hooks and fix all lint/type/format errors

Process bug fix: no pre-commit existed for this repo's Python code.
Added pyproject.toml with unified dependencies (ruff, mypy, ansible-lint),
.pre-commit-config.yaml with repo-based hooks (ruff) and local uv-run
hooks (mypy, ansible-lint).

Fixed 249 ruff errors (B023, B904, B006, B007, UP008, UP031, C408),
~13 mypy type errors, 11 ansible-lint violations, and ruff-format
across all Python files including stack-orchestrator subtree.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

stack_orchestrator/deploy/stack.py

@@ -13,8 +13,9 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http:#www.gnu.org/licenses/>.
 
-from pathlib import Path
 import typing
+from pathlib import Path
+
 from stack_orchestrator.util import get_yaml
 
 
@@ -26,4 +27,4 @@ class Stack:
         self.name = name
 
     def init_from_file(self, file_path: Path):
-        self.obj = get_yaml().load(open(file_path, "r"))
+        self.obj = get_yaml().load(open(file_path))