fix: mark AI tool execution route as dynamic to prevent build-time WASM error

Add `export const dynamic = 'force-dynamic'` to `/api/tools/execute/[...slug]`
to prevent Next.js from attempting static generation at build time.

The AI SDK (used via executeToolWithAgent) requires tiktoken_bg.wasm which
cannot be loaded during static generation. Marking as dynamic ensures the
route is only executed at runtime.

Note: This partially addresses the build error but further investigation needed
for complete resolution of tiktoken WASM loading in Next.js 16 + Turbopack.

Relates to: "Error: Missing tiktoken_bg.wasm"

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

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

apps/web/src/app/api/tools/execute/[...slug]/route.ts

@@ -11,6 +11,7 @@ import { type NextRequest, NextResponse } from 'next/server';
 // Use Node.js runtime for SSE streaming
 export const runtime = 'nodejs';
 export const maxDuration = 60; // 60 seconds timeout
+export const dynamic = 'force-dynamic'; // Prevent static generation for AI SDK routes
 
 interface ExecuteRequest {
   prompt: string;