feat(ST-507): split code from title in backlog parser and seed Scrum4Me with codes

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

prisma/seed.ts

@@ -103,6 +103,7 @@ async function main() {
     data: {
       user_id: demo.id,
       name: 'Scrum4Me',
+      code: 'SCRUM4ME',
       description:
         'Een desktop-first fullstack webapplicatie voor solo developers en kleine Scrum Teams die meerdere softwareprojecten parallel beheren.',
       repo_url: 'https://github.com/madhura68/Scrum4Me',
@@ -126,7 +127,8 @@ async function main() {
     const pbi = await prisma.pbi.create({
       data: {
         product_id: product.id,
-        title: `${ms.key}: ${ms.title}`,
+        code: ms.key,
+        title: ms.title,
         description: ms.goal,
         priority: ms.priority,
         sort_order: ms.sort_order,
@@ -161,6 +163,7 @@ async function main() {
           pbi_id: pbi.id,
           product_id: product.id,
           sprint_id: inSprint ? sprint.id : null,
+          code: s.ref,
           title: s.title,
           description: storySummary,
           acceptance_criteria: s.acceptance_criteria,