Verify plugin-config & stream-route support in API7 EE 3.9.12

[shreemaan-abhishek]

Part of #22.

Against the control-plane codebase / a live API7 EE 3.9.12 instance, confirm whether the management API exposes plugin-config and stream-route.

Status: DONE. Verified against api7ee-3-control-plane:

• stream-route IS exposed — full CRUD at /apisix/admin/stream_routes, mounted handlers, schema, present in generated OpenAPI. Keep the command.
• plugin-config is NOT exposed — no routes, no handlers, not in the generated OpenAPI spec; matches the signature of the known-unsupported consumer_group. Remove the command (see sub-issue for Task test: align E2E coverage with current EE models #2).

[coderabbitai]

🔗 Related PRs

#21 - Remove unsupported API7 resource commands [closed]

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