Replace billing plans with per-runtime usage pricing catalog.

Store explicit hourly/monthly/yearly rates in pricing_rates and addon_rates, compute deploy costs without cycle conversion, and simplify admin UI and wallet payment to cycle-only.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/billing/dto/billing.dto.ts

@@ -197,3 +197,39 @@ export class UpgradeResourcesDto {
 
 export class CalculateUpgradeCostDto extends UpgradeResourcesDto {}
 
+// ─── Platform optional services pricing (Admin) ─────────────────────
+
+export class OptionalServiceCyclePricesDto {
+  @ApiProperty({ example: 500 })
+  @IsNumber()
+  @Min(0)
+  hourly: number;
+
+  @ApiProperty({ example: 50000 })
+  @IsNumber()
+  @Min(0)
+  monthly: number;
+
+  @ApiProperty({ example: 500000 })
+  @IsNumber()
+  @Min(0)
+  yearly: number;
+}
+
+export class SetOptionalServicesPricingDto {
+  @ApiProperty({ type: OptionalServiceCyclePricesDto })
+  @ValidateNested()
+  @Type(() => OptionalServiceCyclePricesDto)
+  redis: OptionalServiceCyclePricesDto;
+
+  @ApiProperty({ type: OptionalServiceCyclePricesDto })
+  @ValidateNested()
+  @Type(() => OptionalServiceCyclePricesDto)
+  rabbitmq: OptionalServiceCyclePricesDto;
+
+  @ApiProperty({ type: OptionalServiceCyclePricesDto })
+  @ValidateNested()
+  @Type(() => OptionalServiceCyclePricesDto)
+  elasticsearch: OptionalServiceCyclePricesDto;
+}
+