Fix D1 database access and add debug endpoint for Cloudflare Pages troubleshooting

src/app/api/debug/env/route.ts

@@ -0,0 +1,42 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+import { NextRequest, NextResponse } from 'next/server';
+
+export const runtime = 'edge';
+
+export async function GET(request: NextRequest) {
+  try {
+    const debugInfo = {
+      timestamp: new Date().toISOString(),
+      environment: {
+        NODE_ENV: process.env.NODE_ENV,
+        NEXT_PUBLIC_STORAGE_TYPE: process.env.NEXT_PUBLIC_STORAGE_TYPE,
+        USERNAME: process.env.USERNAME ? '***' : undefined,
+        PASSWORD: process.env.PASSWORD ? '***' : undefined,
+      },
+      globalThis: {
+        hasDB: typeof globalThis !== 'undefined' && !!(globalThis as any).DB,
+        hasProcess: typeof globalThis !== 'undefined' && !!(globalThis as any).process,
+        hasCloudflare: typeof globalThis !== 'undefined' && !!(globalThis as any).cloudflare,
+      },
+      processEnv: {
+        hasDB: !!(process.env as any).DB,
+        keys: Object.keys(process.env).filter(key => 
+          key.startsWith('DB') || 
+          key.startsWith('NEXT_') || 
+          key.startsWith('CF_') ||
+          key.startsWith('CLOUDFLARE_')
+        ),
+      },
+      runtime: 'edge',
+      userAgent: request.headers.get('user-agent')?.slice(0, 100),
+    };
+
+    return NextResponse.json(debugInfo);
+  } catch (error) {
+    return NextResponse.json({
+      error: 'Debug info collection failed',
+      message: error instanceof Error ? error.message : 'Unknown error',
+      timestamp: new Date().toISOString()
+    }, { status: 500 });
+  }
+}