fix(db): seed staff_id FK fix (GRO-369)

Fixes staff_id FK violation on re-seed: move TRUNCATE before staff upsert and add id to onConflictDoUpdate set clause.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/db/src/schema.ts

@@ -141,7 +141,7 @@ export const pets = pgTable("pets", {
 
 export const services = pgTable("services", {
   id: uuid("id").primaryKey().defaultRandom(),
-  name: text("name").notNull(),
+  name: text("name").notNull().unique(),
   description: text("description"),
   basePriceCents: integer("base_price_cents").notNull(),
   durationMinutes: integer("duration_minutes").notNull(),