fix: proxy direct APNs HTTP2 sessions (#74905)

Summary:
- This PR routes direct APNs HTTP/2 sends through an APNs allowlisted managed-proxy CONNECT wrapper, adds APNs proxy validation/docs/guardrails, and expands regression and live-test coverage.
- Reproducibility: yes. source-reproducible: current main `sendApnsRequest()` still uses raw `http2.connect(au ... nly covers HTTP/global-agent/Undici hooks. I did not run a live APNs reproduction in this read-only review.

Automerge notes:
- PR branch already contained follow-up commit before automerge: test: guard raw HTTP2 APNs connections
- PR branch already contained follow-up commit before automerge: test: guard raw HTTP2 with OpenGrep
- PR branch already contained follow-up commit before automerge: lint: ban raw HTTP2 imports
- PR branch already contained follow-up commit before automerge: fix: use managed proxy state for APNs
- PR branch already contained follow-up commit before automerge: test: exercise APNs active proxy state
- PR branch already contained follow-up commit before automerge: fix: reject conflicting managed proxy activation

Validation:
- ClawSweeper review passed for head dab7c86a75.
- Required merge gates passed before the squash merge.

Prepared head SHA: dab7c86a75
Review: https://github.com/openclaw/openclaw/pull/74905#issuecomment-4350181159

Co-authored-by: jesse-merhi <79823012+jesse-merhi@users.noreply.github.com>
Co-authored-by: clawsweeper <274271284+clawsweeper[bot]@users.noreply.github.com>

.github/workflows/openclaw-live-and-e2e-checks-reusable.yml

@@ -409,6 +409,7 @@ jobs:
               add_profile_suite native-live-src-gateway-profiles-xai "full"
               add_profile_suite native-live-src-gateway-profiles-zai "full"
               add_profile_suite native-live-src-gateway-backends "stable full"
+              add_profile_suite native-live-src-infra "stable full"
               add_profile_suite native-live-test "stable full"
               add_profile_suite native-live-extensions-l-n "full"
               add_profile_suite native-live-extensions-moonshot "full"
@@ -1989,6 +1990,12 @@ jobs:
             timeout_minutes: 90
             profile_env_only: false
             profiles: stable full
+          - suite_id: native-live-src-infra
+            label: Native live infra
+            command: OPENCLAW_LIVE_APNS_REACHABILITY=1 node .release-harness/scripts/test-live-shard.mjs native-live-src-infra
+            timeout_minutes: 45
+            profile_env_only: false
+            profiles: stable full
           - suite_id: native-live-test
             label: Native live test harnesses
             command: node .release-harness/scripts/test-live-shard.mjs native-live-test