chore: add Codacy config to skip B101 in test files

Bandit B101 ('Use of assert detected') is a well-known false positive
for pytest test files where assert is the standard assertion mechanism.
Exclude the tests/ directory from Bandit analysis to prevent 32 false
positives on PR #179.

Author: shenxianpeng

.codacy.yaml

@@ -0,0 +1,9 @@
+---
+# Codacy configuration: https://docs.codacy.com/repositories-configure/codacy-configuration-file/
+engines:
+  bandit:
+    # B101: "Use of assert detected" — assert is standard in pytest test files.
+    # Bandit warns that `assert` statements are removed when running with -O,
+    # but test files are never run in optimized mode. Skip this rule for tests.
+    exclude_paths:
+      - "tests/**"