feat(spa+agentos-server): registry page, agent-less /completion route #7

Job	Run time
build (agentos-server, packages/agentos-server/Dockerfile)	2m 6s
build (agentos-spa, agentos/Dockerfile, spa)	43s
build (computeragent-server, examples/Dockerfile.harness, examples/computeragent-server.ts, harness)	4m 41s
build (harness-server, examples/Dockerfile.harness, examples/harness-server.ts, harness)	6m 5s
	13m 35s

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