feat(llm-model-catalog): set pricing_unit to "tokens" when seeding default models

The curated default catalog is entirely per-token, so seed + syncLlmCatalog
now stamp pricing_unit="tokens" on those rows.

Author: ericallam

internal-packages/database/prisma/schema.prisma

@@ -2909,11 +2909,7 @@ model LlmModel {
   capabilities    String[] @default([]) @map("capabilities")
   isHidden        Boolean  @default(false) @map("is_hidden")
   baseModelName   String?  @map("base_model_name")
-  /// Billing unit the model is priced in, classified by the research-model
-  /// job: "tokens" | "characters" | "images" | "minutes" | "requests" |
-  /// "free" | "not_findable". null until researched. Lets pricing-coverage
-  /// metrics exclude models that aren't priced per-token, and is the
-  /// foundation for non-token pricing support.
+  // "tokens", "images", "characters", "minutes", "requests", "free", "not_findable"; null until researched
   pricingUnit     String?  @map("pricing_unit")
 
   pricingTiers LlmPricingTier[]

internal-packages/llm-model-catalog/src/seed.ts

@@ -46,6 +46,7 @@ export async function seedLlmPricing(prisma: PrismaClient): Promise<{
           capabilities: catalog?.capabilities ?? [],
           isHidden: catalog?.isHidden ?? false,
           baseModelName: catalog?.baseModelName ?? null,
+          pricingUnit: "tokens",
         },
       });
 

internal-packages/llm-model-catalog/src/sync.ts

@@ -74,6 +74,7 @@ export async function syncLlmCatalog(prisma: PrismaClient): Promise<{
             catalog?.baseModelName === undefined
               ? existing.baseModelName
               : catalog.baseModelName,
+          pricingUnit: "tokens",
         },
       });