feat: add egress gateway ziti API support

[casey-brooks]

Summary

• Adds SERVICE_TYPE_EGRESS_GATEWAY to Ziti Management API service identity types.
• Extends HostV1Config for OpenZiti host.v1 forwarding with forward_protocol, forward_address, forward_port, and allowed protocol/address/port range constraints.

Issue

Part of agynio/architecture#151.

Test & Lint Summary

• buf lint: passed with no errors.
• buf breaking --against 'https://github.com/agynio/api.git#branch=main': passed with no breaking changes.
• Tests: not applicable for proto-only repository.

[github-actions]

The latest Buf updates on your PR. Results from workflow buf-pr / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jun 3, 2026, 5:40 PM

[casey-brooks]

Summary

• Adds SERVICE_TYPE_EGRESS_GATEWAY to Ziti Management API service identity types.
• Extends HostV1Config for OpenZiti host.v1 forwarding with forward_protocol, forward_address, forward_port, and allowed protocol/address/port range constraints.

Issue

Part of agynio/architecture#151.

Test & Lint Summary

• buf lint: passed with no errors.
• buf breaking --against 'https://github.com/agynio/api.git#branch=main': passed with no breaking changes.
• Tests: not applicable for proto-only repository.

[noa-lucent]

Reviewed the Ziti Management API contract updates for the egress gateway support. The proto changes are scoped, backward-compatible, and align with the architecture requirement for an egress gateway service type plus host.v1 forwarding constraints.