[codex] Add APIGW schedule polling resource

[dengyh]

What

• Add an APIGW resource for GET /bk_plugin/schedule/{id} and route it to the existing backend schedule endpoint.
• Keep the runtime schedule API behavior unchanged: no new framework setting, no new DRF permission check, and existing direct calls still behave as before.
• Configure the schedule resource as public/apply-able with app authentication only:
  • isPublic: true
  • allowApplyPermission: true
  • userVerifiedRequired: false
  • appVerifiedRequired: true
  • resourcePermissionRequired: false

Why

External platforms can poll plugin execution status through APIGW using the same schedule interface shape, while the gateway handles application identity verification.

Validation

• PYTEST_DISABLE_PLUGIN_AUTOLOAD=1 DJANGO_SETTINGS_MODULE=tests.settings PYTHONPATH=. pytest tests/services/bpf_service/test_resources_yaml.py -q
• black --check tests/services/bpf_service/test_resources_yaml.py
• flake8 tests/services/bpf_service/test_resources_yaml.py
• git diff --check origin/master
• GitHub Actions after e8a69fb: CodeQL, framework unittest, framework lint, runtime lint all passed.