fix: use root-level ruff.toml instead of sdk/python config

The sdk/python config has strict docstring rules (D*) that don't apply
to scripts outside sdk/python/. Add a minimal root-level ruff.toml with
basic E/F/I rules only.

Author: kvinwang

prek.toml

@@ -39,8 +39,8 @@ pass_filenames = false
 repo = "https://github.com/astral-sh/ruff-pre-commit"
 rev = "v0.11.4"
 hooks = [
-    { id = "ruff", args = ["--fix", "--config", "sdk/python/pyproject.toml"] },
-    { id = "ruff-format", args = ["--config", "sdk/python/pyproject.toml"] },
+    { id = "ruff", args = ["--fix"] },
+    { id = "ruff-format" },
 ]
 
 # --- Go: go vet ---

ruff.toml

@@ -0,0 +1,19 @@
+# SPDX-FileCopyrightText: © 2025 Phala Network <dstack@phala.network>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+# Root-level ruff config for pre-commit hooks.
+# sdk/python/ has its own stricter config in pyproject.toml.
+
+line-length = 88
+
+[lint]
+select = [
+    "E",  # pycodestyle errors
+    "F",  # pyflakes
+    "I",  # isort
+]
+ignore = [
+    "E203",  # whitespace before ':'
+    "E501",  # line too long (handled by formatter)
+]