Remove unimplemented endpoints and Enterprise-only parameters from OpenAPI (#10370)

* Remove unimplemented endpoints and Enterprise-only parameters

Strips pure-stub handlers that always return 501 in the Community edition
from the OpenAPI spec, along with Enterprise-only request parameters, so
the OSS swagger accurately reflects the Community API surface.

Endpoints removed (pure stubs — always 501 in OSS):
- getTokenRedirect, getTokenFromMailbox, releaseTokenToMailbox
- commitAsync, commitAsyncStatus
- mergeIntoBranchAsync, mergeIntoBranchAsyncStatus
- getLicense
- pushIcebergTable, pullIcebergTable

Schemas removed (no remaining references):
- License, IcebergPushRequest, IcebergPullRequest, IcebergLocalTable,
  IcebergRemoteTable, IcebergNamespaceRef
- AsyncTaskStatus, CommitAsyncStatus, MergeAsyncStatus

Enterprise-only parameters removed:
- storage_id on RepositoryCreation (kept on Repository response)
- async_ops flag in CapabilitiesConfig

Conditional-501 endpoints (RBAC policies/users/groups, external
principals, presign multipart, expired-object 410s) are preserved — they
have real implementations under other configurations.

Regenerated pkg/api/apigen and the Python / Java / Rust SDKs.

The openapi-breaking-changes CI will fail — intentional, since the
removed endpoints were never implemented in the Community edition.

Note: the lakectl source in this branch will not compile on its own
because some commands still call methods that were removed from the
regenerated API client. The follow-up lakectl cleanup lives in a
stacked PR based on this branch.

* lakectl: clean up commands after OpenAPI endpoint removal (#10373)

Stacked on top of the OpenAPI cleanup PR. Removes the lakectl
commands and flags whose only backing endpoints are no longer in the
Community OpenAPI spec.

- Remove `lakectl login` (used getTokenRedirect / getTokenFromMailbox,
  both always 501 in OSS).
- Drop the `--async` code paths from `lakectl commit` and
  `lakectl merge` (called the async endpoints, which were pure stubs;
  the `AsyncOps` capability flag was hardcoded false so these paths
  were never taken).
- Strip AsyncTaskStatus helpers from `cmd/lakectl/cmd/async.go`. Keep
  the polling constants (`defaultPollInterval`, `minimumPollInterval`,
  `defaultPollTimeout`, `ErrTaskNotCompleted`) — still used by
  `refs dump` / `refs restore`.
- Remove the hidden `--storage-id` flag and `withStorageID` helper
  from `lakectl repo create` / `lakectl repo create-bare`.
- Regenerate `docs/src/reference/cli.md`.

Co-authored-by: Claude <noreply@anthropic.com>

* Restore storage_id on RepositoryCreation

Removing the field from the OpenAPI spec would have been a breaking
change for existing clients that include it in create-repository
requests. Put the field back on the request schema, regenerate clients,
restore the handler's use of body.StorageId, and restore the controller
and python-wrapper tests that exercised it.

* Drop empty getCapabilitiesConfig helper

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: N-o-Z