Added ruff to dependencies

.gitignore

@@ -1,3 +1,5 @@
 .flashrank_cache*
 podcasts/
 .env
+
+.ruff_cache/

surfsense_backend/pyproject.toml

@@ -36,3 +36,95 @@ dependencies = [
     "validators>=0.34.0",
     "youtube-transcript-api>=1.0.3",
 ]
+
+[dependency-groups]
+dev = [
+    "ruff>=0.12.5",
+]
+
+[tool.ruff]
+# Exclude a variety of commonly ignored directories.
+exclude = [
+    ".bzr",
+    ".direnv",
+    ".eggs",
+    ".git",
+    ".git-rewrite",
+    ".hg",
+    ".ipynb_checkpoints",
+    ".mypy_cache",
+    ".nox",
+    ".pants.d",
+    ".pyenv",
+    ".pytest_cache",
+    ".pytype",
+    ".ruff_cache",
+    ".svn",
+    ".tox",
+    ".venv",
+    ".vscode",
+    "__pypackages__",
+    "_build",
+    "buck-out",
+    "build",
+    "dist",
+    "node_modules",
+    "site-packages",
+    "venv",
+    "alembic/versions",
+]
+
+line-length = 88
+indent-width = 4
+
+# Python 3.12
+target-version = "py312"
+
+[tool.ruff.lint]
+select = [
+    "E4",     # pycodestyle errors
+    "E7",     # pycodestyle errors  
+    "E9",     # pycodestyle errors
+    "F",      # Pyflakes
+    "I",      # isort
+    "N",      # pep8-naming
+    "UP",     # pyupgrade
+    "B",      # flake8-bugbear
+    "C4",     # flake8-comprehensions
+    "T20",    # flake8-print
+    "SIM",    # flake8-simplify
+    "RUF",    # Ruff-specific rules
+]
+
+ignore = [
+    "E501",   # Line too long (handled by formatter)
+    "B008",   # Do not perform function calls in argument defaults
+    "T201",   # Print found (allow print statements)
+    "RUF012", # Mutable class attributes should be annotated with `typing.ClassVar`
+]
+
+# Allow fix for all enabled rules (when `--fix`) is provided.
+fixable = ["ALL"]
+unfixable = []
+
+# Allow unused variables when underscore-prefixed.
+dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
+
+[tool.ruff.format]
+# Use double quotes for strings.
+quote-style = "double"
+
+# Indent with spaces, rather than tabs.
+indent-style = "space"
+
+# Respect magic trailing commas.
+skip-magic-trailing-comma = false
+
+# Automatically detect the appropriate line ending.
+line-ending = "auto"
+
+[tool.ruff.lint.isort]
+# Group imports by type
+known-first-party = ["app"]
+force-single-line = false
+combine-as-imports = true