fix: update host and port defaults

[sdg9]

Uses logical defaults for host and port.

If neither defined use localhost 8000. If only port is defined, assume localhost (we need something). If host is defined but port isn't, don't use a port.

[nx-cloud]

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✅ Successfully ran 6 targets

• nx run-many --all --exclude=workspace --target=lint --parallel
• nx run-many --all --exclude=workspace --target=test --parallel --coverage --coverageReporters=lcov
• nx test admin-web
• nx test core-client
• nx test core-server
• nx test utils-generate-guid

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