refactor: remove dead code and unused exports

Delete proxy-auth.ts, types/index.ts, staff-user.ts+test, local-imports.ts+test (only used by their own tests). Remove unused foundation exports: sanitizeFilename, canonicalizeFormValue, canonicalizeFormData, ConflictError, getRequestStore, getClientIp, elapsed. Remove stale TODO comments from rank-authority.ts and notice.ts. Fix biome lint warnings in catalog-repair.ts.

src/lib/foundation/request-context.ts

@@ -30,27 +30,11 @@ export function runWithStore<T>(store: RequestStore, fn: () => T): T {
 	return als.run(store, fn);
 }
 
-// TODO: Check of dit weg kan — niet geïmporteerd in de codebase
-export function getRequestStore(): RequestStore | null {
-	return als.getStore() ?? null;
-}
-
 export function getRequestId(): RequestId {
 	return als.getStore()?.requestId ?? generateRequestId();
 }
 
-// TODO: Check of dit weg kan — niet geïmporteerd in de codebase
-export function getClientIp(): IpAddress {
-	return als.getStore()?.ip ?? ("0.0.0.0" as IpAddress);
-}
-
 export function setContextUserId(userId: UserId): void {
 	const store = als.getStore();
 	if (store) store.userId = userId;
 }
-
-// TODO: Check of dit weg kan — niet geïmporteerd in de codebase
-export function elapsed(): number {
-	const store = als.getStore();
-	return store ? Date.now() - store.startedAt : 0;
-}