fix(readme): make the README code samples compile

[manovotny]

Summary

Follow-up to https://github.com/clerk/clerk/pull/2891, which fixed the same issues on the Go quickstart docs page and flagged this README as having the same config.Key = "sk_live_XXX" bug. clerk.ClientConfig embeds BackendConfig, whose Key field is a *string, so the snippet didn't compile. Auditing the rest of the README's Go snippets turned up several more compile errors, fixed here as well.

Changes

• Usage with a client: config.Key = "sk_live_XXX" → config.Key = clerk.String("sk_live_XXX") (Key is a *string).
• Both $resource$ usage templates: repeated resource, err := ... redeclarations → = for Get/Update; Delete now uses deletedResource, err := since Delete returns *clerk.DeletedResource, not the resource type.
• Concrete organization/user example: added missing context and fmt imports; organizationmembership.List(ctx, params) passed an undefined variable → &listParams; ListParams.OrganizationID is required (it builds the /organizations/{id}/memberships path) and is now set to org.ID; memberships.TotalCount < 0 can never be true → == 0; memberships[0] indexed a struct → memberships.OrganizationMemberships[0]; membership.UserID doesn't exist → membership.PublicUserData.UserID; added error handling and a final fmt.Println(usr.ID) so err and usr are no longer declared-and-not-used.
• Accessing API responses / Errors: bare expression statements (dmn.Response.TraceID, apiErr.TraceID, apiErr.Response.RawJSON) are "evaluated but not used" compile errors → printed with fmt.Println.
• Testing snippets: func (r *mockRoundTripper) RoundTrip(r *http.Request) reused r for receiver and parameter (duplicate argument) → receiver renamed to m; stub bodies were missing return statements → minimal returns added; the last custom backend took reader *clerk.ResponseReader (pointer to interface, doesn't satisfy clerk.Backend) → clerk.ResponseReader; the two client-based tests declared client without using it → a client.Get call added.

The two $resource$ usage blocks stay illustrative fragments by design — beyond the $resource$ placeholder they hold top-level statements (ctx := ..., clerk.SetKey(...)) that aren't valid at Go file scope, so they don't compile standalone even with a real resource substituted. They teach the CRUD shape; the reader drops them into a function and uses the results (the // do something with the resource comment marks that). The complete, compile-clean runnable example immediately follows them. This PR removes their genuine compile bugs (the := redeclarations and the wrong Delete return binding) without turning the concise shape illustrations into full programs.

Verification

All 13 go fences were extracted from the edited README into a scaffold module (each snippet in its own package, fragments wrapped with the minimal package/func boilerplate a reader would supply, $resource$ substituted with user) requiring github.com/clerk/clerk-sdk-go/v2 at this branch's HEAD. go build ./... and go vet ./... both pass. As a negative control, the same harness against the unedited README produces 20 compile-error lines.

References

• https://github.com/clerk/clerk/pull/2891 — the docs-page fix this follows up on

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