fix: move pylint to dev dependencies to resolve GPL-2.0 Snyk flag

pylint is a static analysis tool not shipped in the production package.
Moving it to requirements-dev.txt removes the GPL-2.0 copyleft concern
from Snyk production dependency scans (DX-8256).

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

Author: OMpawar-21

requirements-dev.txt

@@ -0,0 +1,4 @@
+# Development-only dependencies — not shipped in the production package.
+# GPL-licensed tools live here so copyleft obligations don't apply to distributed code.
+-r requirements.txt
+pylint>=2.0.0

requirements.txt

@@ -3,7 +3,6 @@ python-dotenv>=1.2.2
 setuptools>=83.0.0
 requests>=2.33.0,<3.0.0
 urllib3>=2.7.0,<3.0.0
-pylint>=2.0.0
 requests-toolbelt>=1.0.0,<2.0.0
 pyotp==2.9.0
 packaging>=24.0