fix: add requests as direct dependency

The committed code in module/utils/json_config.py imports requests
directly, which is needed by the search_provider config module.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: EstrellaXD

backend/pyproject.toml

@@ -24,6 +24,7 @@ dependencies = [
     "sse-starlette>=1.6.5",
     "webauthn>=2.0.0",
     "urllib3>=2.0.3",
+    "requests>=2.31.0",
 ]
 
 [dependency-groups]