fix: add json tags to AdminModelRow (was serializing as PascalCase)

backend/internal/store/provider_models_admin.go

@@ -9,19 +9,19 @@ import (
 // AdminModelRow is a catalog entry for the admin view (includes blocked /
 // unavailable rows, with both discovered and override pricing).
 type AdminModelRow struct {
-	ID                 uuid.UUID
-	ProviderName       string
-	Slug               string
-	DisplayName        string
-	Source             string
-	Available          bool
-	Enabled            bool
-	Blocked            bool
-	ContextLength      *int
-	DiscInputPerMTok   *float64
-	DiscOutputPerMTok  *float64
-	PriceInputPerMTok  *float64
-	PriceOutputPerMTok *float64
+	ID                 uuid.UUID `json:"id"`
+	ProviderName       string    `json:"provider_name"`
+	Slug               string    `json:"slug"`
+	DisplayName        string    `json:"display_name"`
+	Source             string    `json:"source"`
+	Available          bool      `json:"available"`
+	Enabled            bool      `json:"enabled"`
+	Blocked            bool      `json:"blocked"`
+	ContextLength      *int      `json:"context_length"`
+	DiscInputPerMTok   *float64  `json:"disc_input_per_mtok"`
+	DiscOutputPerMTok  *float64  `json:"disc_output_per_mtok"`
+	PriceInputPerMTok  *float64  `json:"price_input_per_mtok"`
+	PriceOutputPerMTok *float64  `json:"price_output_per_mtok"`
 }
 
 // ListModelsAdmin lists every catalog entry (no servability filter) for admin.