Auth/ PM-41503 & PM-41533 - Add openOrgInvite param to SDK registration finish call

[JaredSnider-Bitwarden]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-41503
https://bitwarden.atlassian.net/browse/PM-41533

Server PR: bitwarden/server#8159
Server SDK Bindings Update PR: bitwarden/sdk-internal#1372
SDK PR which wires up breaking changes: bitwarden/sdk-internal#1363 (⚠️ unmerged)

📔 Objective

The SDK's UserMasterPasswordRegistrationRequest will gain a new openOrgInvite field (Option<RegistrationFinishOpenOrgInviteData>) to support finishing registration via an open organization invite link once bitwarden/sdk-internal#1363 merges. iOS does not use open-org-invite (that flow is web-only), so this passes nil at the sole call site to satisfy the new required constructor parameter.

📸 Screenshots

n/a

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

This PR adds a single openOrgInvite: nil argument to the sole UserMasterPasswordRegistrationRequest construction in CompleteRegistrationProcessor, keeping the call site compatible with the upcoming SDK constructor change. Passing nil is correct for iOS since the open-org-invite registration flow is web-only, and it matches the surrounding pattern where all other invite/token parameters are also nil. A repository-wide search confirms this is the only construction of that type, so no other call sites or fixtures need updating. No security, correctness, or breaking-change concerns were identified.

Code Review Details

No findings.

Merge-order note (not a code finding): the BitwardenSdk package pin in project-common.yml (revision: 3dbc27249f48fcb88c56739ece52e2335701de0b) is unchanged in this PR, and the Test check is currently failing. This is consistent with the PR description's note that the SDK change (bitwarden/sdk-internal#1363) is still unmerged — this PR presumably needs to land after the SDK pin is bumped so CI can compile the new parameter.

Existing tests in CompleteRegistrationProcessorTests.swift do not assert on the other nil invite/token fields either, so not asserting openOrgInvite is consistent with the established test convention and is not flagged.