[Feature]: Add organization support for B2B users, memberships, and organization-aware auth context.

[Bccorb]

Problem statement

For enterprise adopters organizations becomes a valuable feature as within a company there may be the need for further delegation.

Proposed solution

• Organizations can be created, read, updated, and archived.
• Users can belong to multiple organizations.
• Membership roles are independent from global roles.
• Authenticated responses can include organization membership context.
• Admin APIs can manage memberships.

Alternatives considered

No response

Impact area

Developer experience