feat(ST-mgsu85hr): Prisma schema — token-velden op ClaudeJob + ModelPrice model (#112)

- Voeg model_id, input_tokens, output_tokens, cache_read_tokens, cache_write_tokens (nullable) toe aan ClaudeJob
- Voeg nieuw ModelPrice model toe met per-1M prijsvelden en currency default USD
- Migratie 20260506010013_add_token_usage_fields aangemaakt en toegepast
- Seed uitgebreid met standaardprijzen voor claude-opus-4-7, claude-sonnet-4-6, claude-haiku-4-5-20251001

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

prisma/seed.ts

@@ -193,6 +193,39 @@ async function main() {
     }
   }
 
+  const modelPrices = [
+    {
+      model_id: 'claude-opus-4-7',
+      input_price_per_1m: 15.0,
+      output_price_per_1m: 75.0,
+      cache_read_price_per_1m: 1.5,
+      cache_write_price_per_1m: 18.75,
+    },
+    {
+      model_id: 'claude-sonnet-4-6',
+      input_price_per_1m: 3.0,
+      output_price_per_1m: 15.0,
+      cache_read_price_per_1m: 0.3,
+      cache_write_price_per_1m: 3.75,
+    },
+    {
+      model_id: 'claude-haiku-4-5-20251001',
+      input_price_per_1m: 0.8,
+      output_price_per_1m: 4.0,
+      cache_read_price_per_1m: 0.08,
+      cache_write_price_per_1m: 1.0,
+    },
+  ]
+
+  for (const mp of modelPrices) {
+    await prisma.modelPrice.upsert({
+      where: { model_id: mp.model_id },
+      update: mp,
+      create: mp,
+    })
+    console.log(`  ModelPrice upserted: ${mp.model_id}`)
+  }
+
   console.log('\nSeeding complete!')
   console.log('Demo user:  username=demo     password=demo1234')
   console.log('Main user:  username=lars     password=scrum4me123')