chore: remove dead code and unused dependencies

Cleans up stale implementation artifacts:
- Delete legacy `src/webhook.ts` (dead code per AGENTS.md)
- Delete admin composables `useMe.ts` and `useRoutes.ts`
- Remove unused dependencies `jose` and `yaml`
- Remove stale `Me` interface, `FILTER_LABELS`, `invalidateConfigCache`, and formatter re-exports

admin/types.ts

@@ -33,13 +33,6 @@ export interface Group {
   emoji?: boolean;
 }
 
-export interface Me {
-  login: string;
-  userId: string;
-  isSuper: boolean;
-  groups: Group[];
-}
-
 export interface RouteTemplate {
   id: string;
   nameKey: string;
@@ -125,15 +118,6 @@ export const ROUTE_TEMPLATES: RouteTemplate[] = [
 
 export const FILTER_TYPES = ["event", "repo", "actor", "action", "branch", "keyword"] as const;
 
-export const FILTER_LABELS: Record<string, string> = {
-  event: "Event",
-  repo: "Repo",
-  actor: "Actor",
-  action: "Action",
-  branch: "Branch",
-  keyword: "Keyword",
-};
-
 export function fmtMatch(match: string | string[]): string {
   if (Array.isArray(match)) return match.join(", ");
   return String(match ?? "");