feat: generate standalone admin SDK

[walker-tx]

Stack context

This PR is the second part of a four-PR stack that moves organization product-feature management from the legacy Dashboard Platform Admin surface into the standalone Admin application.

The preceding PR, #6036, establishes the shared backend contract, Goa operations, and isolated Dashboard/Admin OpenAPI inputs. This PR consumes that Admin-specific contract to generate a private TypeScript SDK and places it behind a constrained same-origin application boundary. The next PR uses this client to deliver feature-management parity in Admin, after which the final PR removes the duplicate Dashboard surface.

What this PR does

• generates and commits the private TypeScript Admin SDK from the isolated Admin OpenAPI source
• provides a module-private, same-origin client boundary using the ambient Admin session cookie
• adds resolver, overlay, formatter, and CI drift checks for generated Admin artifacts
• prevents application callers from overriding the server URL, browser credentials, or authorization headers

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