feat: rename the database from Settings, keeping all config

Adds a Rename button to Settings -> Database: renames the current SQLite database
(e.g. opslog.db -> F4BPO.db) while preserving every setting/profile, unlike New
database which starts empty. Implemented as a VACUUM INTO copy + pointer switch;
the old file (open and locked now) is scheduled via config.json delete_pending
and removed, with its -wal/-shm sidecars, on the next launch.

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

@@ -678,6 +678,8 @@ export function ReloadUDPIntegrations():Promise<Array<string>>;
 
 export function RemovePassphrase(arg1:string):Promise<void>;
 
+export function RenameDatabase(arg1:string):Promise<void>;
+
 export function RenderEQSL(arg1:number,arg2:number):Promise<string>;
 
 export function ReplaceAwardReferences(arg1:string,arg2:Array<awardref.Ref>):Promise<number>;