[doc] Document per-target reverse proxy access control

[mlsmaycon]

HTTP targets can inherit service authentication, bypass authentication, or block access. This documents the optional Access setting, literal longest-prefix matching, restrictions that still apply, and access-log labels. Upgrade all proxies before using target actions; older proxies ignore them and retain service authentication.

Regenerates the service API reference with access_action.

Implementation: netbirdio/netbird#7954
Dashboard: netbirdio/dashboard#823

Validation: MDX lint and production build passed (339 static pages). Full lint reports existing shared-UI errors.

Keep this draft until the implementation is available to users.

[vercel]

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Project	Deployment	Actions	Updated
docs	Ready	Preview	Oct 1, 2026 10:41pm UTC

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