fix: make Prisma import lazy in playground to prevent module initialization failures

- Remove top-level Prisma import from dynamic-tool-loader.ts
- Use dynamic import in reportToolFailure function instead
- Prevents entire module from failing if DATABASE_URL is missing
- Fixes API route timeout issue caused by module initialization failure

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

apps/playground/src/lib/dynamic-tool-loader.ts

@@ -1,4 +1,3 @@
-import { prisma } from '@tpmjs/db';
 import { jsonSchema, tool } from 'ai';
 
 // Cache for tool wrappers (process-level)
@@ -49,6 +48,9 @@ async function reportToolFailure(
   phase: 'import' | 'execution'
 ): Promise<void> {
   try {
+    // Lazy load Prisma to avoid module initialization failures
+    const { prisma } = await import('@tpmjs/db');
+
     // Find the tool in the database
     const tool = await prisma.tool.findFirst({
       where: {