前端：配置渠道倍率并精简长上下文开关

frontend/src/api/admin/channels.ts

@@ -17,6 +17,10 @@ export interface PricingInterval {
   output_price: number | null
   cache_write_price: number | null
   cache_read_price: number | null
+  input_multiplier: number | null
+  output_multiplier: number | null
+  cache_write_multiplier: number | null
+  cache_read_multiplier: number | null
   per_request_price: number | null
   sort_order: number
 }
@@ -41,6 +45,8 @@ export interface ChannelModelPricing {
   output_price: number | null
   cache_write_price: number | null
   cache_read_price: number | null
+  fast_multiplier?: number | null
+  flex_multiplier?: number | null
   image_input_price: number | null
   image_output_price: number | null
   per_request_price: number | null