feat(cluster): preserve isolated replication over gRPC

[yordis]

• Preserves isolated replication topology and failure detection on the supported gRPC transport.

[cursor]

PR Summary

High Risk
Changes core cluster topology, replication transport, and gossip compatibility; misconfiguration of split listeners or endpoint matching could break replication and leader redirect behavior.

Overview
This PR replaces TCP-based cluster replication and client routing with gRPC on a dedicated Kestrel listener, and drops internal/external TCP endpoints from gossip, elections, leader discovery, and the admin cluster UI.

Runtime wiring: the node listens separately on node HTTP and replication HTTP/2 ports. A ReplicationEndpointPolicy returns 404 when replication gRPC paths hit the wrong listener (and vice versa). NodeConnectionTracker wraps connections to record bytes, TLS, and HTTP vs gRPC usage for observability. Replica stats in the dashboard now correlate members by HTTP endpoint instead of internal TCP.

Cluster model: MemberInfo carries ReplicationEndPoint (defaulting to HTTP for mixed-version gossip). Gossip gRPC round-trip preserves replication endpoints; ClientClusterInfo and NotHandled leader info expose HTTP only. Config adds ReplicationPortAdvertiseAs (with deprecated alias) and validates that node and replication listeners do not overlap on the same address/port.

Tests: TCP unit-test plugin, legacy ClientAPI helpers, and TCP transport tests are removed; MiniNode / cluster fixtures use node + replication endpoints; integration tests use gRPC streams clients instead of EventStoreConnection.

^{Reviewed by Cursor Bugbot for commit afa6107. Bugbot is set up for automated code reviews on this repo. Configure here.}

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 7401ff7b-1a9a-4960-b2df-1920d1e7ce87

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, have a team admin enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit dbf4cb3. Configure here.}