Add SQLite visitor IP logging to /server_storage

Log visitor IPs and paths to a local SQLite database via the existing
analytics API route, persisted at /server_storage/visitors.db in Docker
(falls back to ./visitors.db in dev).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/api/analytics/route.ts

@@ -1,4 +1,5 @@
 import { NextResponse } from 'next/server';
+import { logVisit } from '@/lib/db';
 
 const ANALYTICS_KEY = process.env.ANALYTICS_KEY || 'default-analytics-key';
 
@@ -19,6 +20,12 @@ export async function POST(req: Request) {
         const forwarded = headers.get('x-forwarded-for');
         const ip = forwarded ? forwarded.split(',')[0].trim() : 'unknown';
 
+        try {
+            logVisit(ip, body.path);
+        } catch (e) {
+            console.error('Failed to log visit to SQLite', e);
+        }
+
         const adminUrl = process.env.ADMIN_DASH_URL || 'http://admin_dash:3000/api/track';
 
         fetch(adminUrl, {