test: add requests to test/dev extras for HTTP API and docs-example tests

Two test files (test_server_patterns.py, test_docs_examples.py) skip when
'requests' is unavailable. Declaring it in the test/dev optional-dependency
groups makes those tests run in CI and fresh installs instead of silently
skipping.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: tae898

bindings/python/pyproject.toml

@@ -39,6 +39,7 @@ test = [
     "pytest>=7.0.0",
     "pytest-cov",
     "numpy>=1.20.0",
+    "requests>=2.0.0",  # HTTP API / docs-example tests
 ]
 dev = [
     "black",
@@ -47,6 +48,7 @@ dev = [
     "pytest>=7.0.0",
     "pytest-cov",
     "numpy>=1.20.0",
+    "requests>=2.0.0",  # HTTP API / docs-example tests
     "bandit>=1.9.0",
 ]
 vector = [