Update register.md

[alabulei1]

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[juntao]

Hello, I am a PR summary agent on flows.network. Here are my reviews of code commits in this PR.

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Commit 3494e699c0a75a763d9d44995810576800ab103a

Key Changes

• Authentication: The registration request now includes an Authorization header with the value Bearer YOUR_API_KEY_GOES_HERE. This is crucial for securing communication between clients and services.
• URL Structure: Services are expected to use a consistent URL structure. Local URLs should start with http://localhost:port (e.g., http://localhost:8080/v1). Remote URLs should start with https://domain.com/v1 (e.g., https://0x448f0405310a9258cd5eab5f25f15679808c5db2.gaia.domains/v1).
• Service Registration: Each service can be registered by making a POST request to http://localhost:3389/admin/servers/register, providing the service's URL and kind (e.g., chat, embeddings, image, audio). The kind should be in lowercase, as specified in the code.
• Notes: It is recommended to use a versioned endpoint (v1) in URLs for clarity and consistency across services.