feat: Publish-to-catalog export for awards (edit in UI, version, ship to team)

Adds ExportAwardForCatalog(code, version): writes the selected award as a
catalog-format JSON ({"def":…,"references":…}) stamped with a version and with
user_edited cleared, ready to paste over internal/award/catalog/<code>.json. A
new release then propagates the change to the whole team via mergeCatalog —
unedited copies auto-upgrade, edited ones are offered the update.

UI: a version input + "Publish to catalog…" button in the award editor footer,
defaulting to one past the award's current version.

frontend/wailsjs/go/main/App.d.ts

@@ -168,6 +168,8 @@ export function ExportADIFSelected(arg1:string,arg2:boolean,arg3:Array<number>):
 
 export function ExportAward(arg1:string):Promise<string>;
 
+export function ExportAwardForCatalog(arg1:string,arg2:number):Promise<string>;
+
 export function ExportAwards():Promise<string>;
 
 export function ExportCabrillo(arg1:string):Promise<main.CabrilloResult>;