fix: use Web Crypto API for Cloudflare Workers compatibility

- d1.ts: Use global crypto.randomUUID() instead of importing from 'crypto'
- sqlite.ts: Use 'node:crypto' import for Node.js compatibility

This fixes the Cloudflare Workers deployment error:
"The package 'crypto' wasn't found on the file system but is built into node"

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

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

src/storage/d1.ts

@@ -1,4 +1,4 @@
-import { randomUUID } from 'crypto';
+// Use Web Crypto API (available globally in Cloudflare Workers)
 import {
   Storage,
   Offer,
@@ -402,8 +402,8 @@ export class D1Storage implements Storage {
     service: Service;
     indexUuid: string;
   }> {
-    const serviceId = randomUUID();
-    const indexUuid = randomUUID();
+    const serviceId = crypto.randomUUID();
+    const indexUuid = crypto.randomUUID();
     const now = Date.now();
 
     // Insert service