byoc: improve architecture diagram in style

[lilin90]

What is changed, added or deleted? (Required)

Replaced the BYOC architecture diagram with a new one, which has consistent capitalization style and better aligned elements.

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[wildpcww]

lgtm

[wildpcww]

lgtm

[lilin90]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lilin90

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