feat(query-graphql): expose computeAuthorizationFilter on Authorizer

[jtomaszewski]

Summary

Adds a public computeAuthorizationFilter(context, authorizationContext)
method on the Authorizer<DTO> interface. It's an intention-revealing
alias of authorize() — DefaultAuthorizer and the internal relation
authorizer delegate to authorize(), so behavior is unchanged.

Motivation

Today, consumers outside the generated CRUD resolvers (custom resolvers,
domain services) that want to apply the same authorization filter the
@Authorize pipeline produces must call authorize(). That works, but
the name reads as an extension hook, not a call site — readers routinely
misread domain-service code as mutating/deciding auth rather than just
reusing the decorator's output.

This method gives a clear, public, read-only name for the operation:
compute the auth filter I'd get from @Authorize.

Stacked on #5 (patch 1/4) conceptually; no code dependency.

Test plan

• New test should expose computeAuthorizationFilter as a public alias of authorize in default-crud-auth.service.spec.ts
• yarn nx test query-graphql — 498 tests pass
• yarn nx build query-graphql

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commit: 7e34b9f

[jtomaszewski]

Closing — this patch is a pure rename alias of authorize() with no behavior change. Consumers can call authorizer.authorize(ctx, authCtx) directly (or wrap in a one-line helper in the Tournee backend). Not worth the fork drift. Tracked in SPEC-001.