Add dev tooling and clean up repo config

- Add justfile with common development tasks
- Add pre-commit config for code quality hooks
- Remove requirements.txt (deps managed via pyproject.toml)
- Update .gitignore for local/generated files

Author: alexanderv-sifi

.gitignore

@@ -54,4 +54,13 @@ test_data_*
 # PyInstaller specific
 *.manifest
 *.spec
-!fileshift.spec
+!fileshift.spec
+# Claude Code
+.claude/settings.local.json
+
+# Coverage
+.coverage
+coverage.xml
+
+# Serena
+.serena/

.pre-commit-config.yaml

@@ -0,0 +1,38 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.5.0
+    hooks:
+      - id: check-yaml
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+      - id: check-added-large-files
+      - id: check-json
+      - id: check-merge-conflict
+      - id: check-toml
+      - id: debug-statements
+      - id: mixed-line-ending
+
+  - repo: https://github.com/psf/black
+    rev: 23.12.1
+    hooks:
+      - id: black
+        language_version: python3.9
+
+  - repo: https://github.com/pycqa/isort
+    rev: 5.13.2
+    hooks:
+      - id: isort
+        args: ["--profile", "black"]
+
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.1.9
+    hooks:
+      - id: ruff
+        args: [--fix, --exit-non-zero-on-fix]
+
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v1.8.0
+    hooks:
+      - id: mypy
+        additional_dependencies: [types-PyQt6]
+        args: [--ignore-missing-imports]