chore: migrate Prisma config from package.json to prisma.config.ts

Fixes deprecation warning:
"The configuration property 'package.json#prisma' is deprecated and
will be removed in Prisma 7."

Changes:
- Created apps/api/prisma.config.ts with seed configuration
- Removed deprecated "prisma" field from apps/api/package.json
- Uses defineConfig from "prisma/config" per Prisma 6+ standards

Migration verified with successful prisma generate.

Refs https://pris.ly/prisma-config

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

docs/reports/qa-automation/pending/home-jwoltje-src-mosaic-stack-apps-api-prisma.config.ts_20260131-1031_1_remediation_needed.md

@@ -0,0 +1,20 @@
+# QA Remediation Report
+
+**File:** /home/jwoltje/src/mosaic-stack/apps/api/prisma.config.ts
+**Tool Used:** Write
+**Epic:** general
+**Iteration:** 1
+**Generated:** 2026-01-31 10:31:35
+
+## Status
+
+Pending QA validation
+
+## Next Steps
+
+This report was created by the QA automation hook.
+To process this report, run:
+
+```bash
+claude -p "Use Task tool to launch universal-qa-agent for report: /home/jwoltje/src/mosaic-stack/docs/reports/qa-automation/pending/home-jwoltje-src-mosaic-stack-apps-api-prisma.config.ts_20260131-1031_1_remediation_needed.md"
+```

docs/reports/qa-automation/pending/home-jwoltje-src-mosaic-stack-apps-api-prisma.config.ts_20260131-1031_2_remediation_needed.md

@@ -0,0 +1,20 @@
+# QA Remediation Report
+
+**File:** /home/jwoltje/src/mosaic-stack/apps/api/prisma.config.ts
+**Tool Used:** Edit
+**Epic:** general
+**Iteration:** 2
+**Generated:** 2026-01-31 10:31:53
+
+## Status
+
+Pending QA validation
+
+## Next Steps
+
+This report was created by the QA automation hook.
+To process this report, run:
+
+```bash
+claude -p "Use Task tool to launch universal-qa-agent for report: /home/jwoltje/src/mosaic-stack/docs/reports/qa-automation/pending/home-jwoltje-src-mosaic-stack-apps-api-prisma.config.ts_20260131-1031_2_remediation_needed.md"
+```

docs/reports/qa-automation/pending/home-jwoltje-src-mosaic-stack-apps-api-prisma.config.ts_20260131-1032_1_remediation_needed.md

@@ -0,0 +1,20 @@
+# QA Remediation Report
+
+**File:** /home/jwoltje/src/mosaic-stack/apps/api/prisma.config.ts
+**Tool Used:** Write
+**Epic:** general
+**Iteration:** 1
+**Generated:** 2026-01-31 10:32:31
+
+## Status
+
+Pending QA validation
+
+## Next Steps
+
+This report was created by the QA automation hook.
+To process this report, run:
+
+```bash
+claude -p "Use Task tool to launch universal-qa-agent for report: /home/jwoltje/src/mosaic-stack/docs/reports/qa-automation/pending/home-jwoltje-src-mosaic-stack-apps-api-prisma.config.ts_20260131-1032_1_remediation_needed.md"
+```