fix(httpapi): re-land workspace create payload accepts missing extra (#25412)

packages/opencode/src/server/routes/instance/httpapi/groups/workspace.ts

@@ -9,7 +9,10 @@ import { WorkspaceRoutingMiddleware } from "../middleware/workspace-routing"
 import { described } from "./metadata"
 
 const root = "/experimental/workspace"
-export const CreatePayload = Schema.Struct(Struct.omit(Workspace.CreateInput.fields, ["projectID"]))
+export const CreatePayload = Schema.Struct({
+  ...Struct.omit(Workspace.CreateInput.fields, ["projectID", "extra"]),
+  extra: Schema.optional(Workspace.CreateInput.fields.extra),
+})
 export const SessionRestorePayload = Schema.Struct(Struct.omit(Workspace.SessionRestoreInput.fields, ["workspaceID"]))
 export const SessionRestoreResponse = Schema.Struct({
   total: NonNegativeInt,

packages/opencode/src/server/routes/instance/httpapi/handlers/workspace.ts

@@ -24,6 +24,7 @@ export const workspaceHandlers = HttpApiBuilder.group(InstanceHttpApi, "workspac
       return yield* workspace
         .create({
           ...ctx.payload,
+          extra: ctx.payload.extra ?? null,
           projectID: instance.project.id,
         })
         .pipe(Effect.mapError(() => new HttpApiError.BadRequest({})))