feat: admin provider UI (types, hooks, guard, settings panel, conditional admin nav)

k-tv-frontend/lib/types.ts

@@ -131,6 +131,18 @@ export interface ConfigResponse {
   providers: ProviderInfo[];
   /** Primary provider capabilities — kept for backward compat. */
   provider_capabilities: ProviderCapabilities;
+  available_provider_types: string[];
+}
+
+export interface ProviderConfig {
+  provider_type: string;
+  config_json: Record<string, string>;
+  enabled: boolean;
+}
+
+export interface ProviderTestResult {
+  ok: boolean;
+  message: string;
 }
 
 // Auth
@@ -145,6 +157,7 @@ export interface UserResponse {
   id: string;
   email: string;
   created_at: string;
+  is_admin: boolean;
 }
 
 // Channels