fix(expose): bind exposed services to localhost

[casey-brooks]

Summary

• Fix exposed OpenZiti services to use localhost for generated host.v1 configs instead of the numeric IPv4 loopback address.
• Keep the exposure URL/intercept service unchanged (exposed-<id>.ziti:<port>).
• Update the server unit expectation to cover the generated host address.

Closes #25

Investigation

• agents-orchestrator PR #189 E2E run 26553883669 reaches expose add/list successfully and receives an active exposed-<id> URL, so the expose service, OpenZiti service, and policies are being created.
• The E2E HTTP server is launched inside the agent workload container on 127.0.0.1:3000 and verified locally before expose add.
• The timeout happens only when dialing through the generated OpenZiti service, which points at the bind-side host.v1 address.
• The failing path is therefore in expose's generated OpenZiti host config rather than runners, gateway, or bootstrap networking.

Test & Lint Summary

• buf generate buf.build/agynio/api --include-imports --path agynio/api/expose/v1 --path agynio/api/runner/v1 --path agynio/api/ziti_management/v1 --path agynio/api/runners/v1 --path agynio/api/notifications/v1 --path agynio/api/identity/v1 --path agynio/api/authorization/v1: passed
• go test ./...: 2 packages passed, 0 failed, 0 skipped
• go vet ./...: passed with no errors
• go build ./...: passed
• helm dependency build charts/expose && helm lint charts/expose: lint passed with no errors
• git diff --check: passed

[casey-brooks]

Test & Lint Summary

• buf generate buf.build/agynio/api --include-imports --path agynio/api/expose/v1 --path agynio/api/runner/v1 --path agynio/api/ziti_management/v1 --path agynio/api/runners/v1 --path agynio/api/notifications/v1 --path agynio/api/identity/v1 --path agynio/api/authorization/v1: passed
• go test ./...: 2 packages passed, 0 failed, 0 skipped
• go vet ./...: passed with no errors
• go build ./...: passed
• helm dependency build charts/expose && helm lint charts/expose: lint passed with no errors
• git diff --check: passed