fix: Use native img tags for admin pages

- Replace next/image with native img tags in admin bottles, splits, tastings
- Remove hardcoded Supabase hostname from next.config.mjs
- Native img works with any hostname without config changes on deploy

src/app/admin/bottles/AdminBottlesList.tsx

@@ -1,8 +1,7 @@
 'use client';
 
 import { useState, useMemo } from 'react';
-import { Search, Filter, User, Wine, Calendar, Star, X, ChevronDown } from 'lucide-react';
-import Image from 'next/image';
+import { Search, User, Wine, Star, X } from 'lucide-react';
 
 interface Bottle {
     id: string;
@@ -205,12 +204,10 @@ export default function AdminBottlesList({ bottles }: AdminBottlesListProps) {
                             {/* Image */}
                             <div className="aspect-[4/3] relative bg-zinc-800">
                                 {bottle.image_url ? (
-                                    <Image
+                                    <img
                                         src={bottle.image_url}
                                         alt={bottle.name || 'Bottle'}
-                                        fill
-                                        className="object-cover"
-                                        sizes="(max-width: 768px) 100vw, (max-width: 1200px) 50vw, 33vw"
+                                        className="absolute inset-0 w-full h-full object-cover"
                                     />
                                 ) : (
                                     <div className="absolute inset-0 flex items-center justify-center">