fix: align production defaults and close review parity gaps

Ship greenfield min_rr=2.0 and conf=0, read-only Structural S/R, indicator
cache invalidation, and UI/gate language that treats GTL as screening not exit.
Align strategy_rank missing-vol fallback live vs backtest, single-source
PRIMARY_TARGET_MIN_RR, expand prod parity tests, and drop dead FE clients.

frontend/src/api/admin.ts

@@ -56,12 +56,6 @@ export function updateSetting(key: string, value: string) {
     .then((r) => r.data);
 }
 
-export function updateRegistration(enabled: boolean) {
-  return apiClient
-    .put<{ message: string }>('admin/settings/registration', { enabled })
-    .then((r) => r.data);
-}
-
 export function getRecommendationSettings() {
   return apiClient
     .get<RecommendationConfig>('admin/settings/recommendations')

frontend/src/api/trades.ts

@@ -14,7 +14,3 @@ export function list(params?: TradeListParams) {
 export function bySymbol(symbol: string) {
   return apiClient.get<TradeSetup[]>(`trades/${symbol.toUpperCase()}`).then((r) => r.data);
 }
-
-export function history(symbol: string) {
-  return apiClient.get<TradeSetup[]>(`trades/${symbol.toUpperCase()}/history`).then((r) => r.data);
-}