Add platform filter to Discover, alongside keyword and TLD

Filters sites by server/powered_by/generator (e.g. "Shopify",
"WordPress", "nginx"), combinable with the existing keyword/TLD
filters. Results table now also shows each site's detected platform.

Verified: platform=Wix correctly isolates the one known Wix site,
tld=es+platform=nginx narrows to the 12 real nginx-hosted .es sites,
and the no-match case renders the empty state correctly.

app/Livewire/Discover/Search.php

@@ -13,7 +13,8 @@ use Livewire\WithPagination;
 /**
  * The competitor-discovery search: "who sells honey with a .es domain?" — keyword
  * matches a site's pages via MySQL fulltext (natural language mode, so free-text input
- * never trips a boolean-mode syntax error), TLD filters the site's domain suffix.
+ * never trips a boolean-mode syntax error), TLD filters the site's domain suffix,
+ * platform filters its detected server/powered-by/generator signature.
  */
 #[Layout('components.layouts.app')]
 class Search extends Component
@@ -26,6 +27,9 @@ class Search extends Component
     #[Url(as: 'tld', history: true)]
     public string $tld = '';
 
+    #[Url(as: 'platform', history: true)]
+    public string $platform = '';
+
     public function updatingKeyword(): void
     {
         $this->resetPage();
@@ -36,11 +40,17 @@ class Search extends Component
         $this->resetPage();
     }
 
+    public function updatingPlatform(): void
+    {
+        $this->resetPage();
+    }
+
     public function render(): View
     {
         $keyword = trim($this->keyword);
         $tld = strtolower(trim(ltrim($this->tld, '.')));
-        $hasQuery = $keyword !== '' || $tld !== '';
+        $platform = trim($this->platform);
+        $hasQuery = $keyword !== '' || $tld !== '' || $platform !== '';
 
         // Without any filter this would just be the full site list — that's what the
         // Sites page is for. Discover only returns results once you've asked it something.
@@ -56,6 +66,13 @@ class Search extends Component
                     )
                 )
                 ->when($tld !== '', fn ($query) => $query->where('domain', 'like', '%.'.$tld))
+                ->when($platform !== '', function ($query) use ($platform) {
+                    $query->where(function ($query) use ($platform) {
+                        $query->where('server', 'like', '%'.$platform.'%')
+                            ->orWhere('powered_by', 'like', '%'.$platform.'%')
+                            ->orWhere('generator', 'like', '%'.$platform.'%');
+                    });
+                })
                 ->withCount(['pages as matching_pages_count' => function ($pageQuery) use ($keyword) {
                     if ($keyword !== '') {
                         $pageQuery->whereFullText(['title', 'description', 'keywords', 'content'], $keyword);

resources/views/livewire/discover/search.blade.php

@@ -1,7 +1,7 @@
 <div class="mx-auto max-w-5xl px-4 py-8">
     <h1 class="text-2xl font-semibold">Discover competitors</h1>
     <p class="mt-1 text-sm text-neutral-500">
-        Find sites by what they sell and where — e.g. keyword "honey", TLD "es".
+        Find sites by what they sell, where, and what they're built on — e.g. keyword "honey", TLD "es", platform "Shopify".
     </p>
 
     <div class="mt-6 flex flex-wrap gap-3">
@@ -17,6 +17,12 @@
             placeholder="TLD, e.g. es"
             class="w-full max-w-[10rem] rounded-md border border-neutral-300 px-3 py-2 text-sm focus:border-neutral-500 focus:outline-none dark:border-neutral-700 dark:bg-neutral-900"
         >
+        <input
+            type="text"
+            wire:model.live.debounce.400ms="platform"
+            placeholder="Platform, e.g. WordPress"
+            class="w-full max-w-[14rem] rounded-md border border-neutral-300 px-3 py-2 text-sm focus:border-neutral-500 focus:outline-none dark:border-neutral-700 dark:bg-neutral-900"
+        >
     </div>
 
     <div class="mt-6 overflow-hidden rounded-lg border border-neutral-200 dark:border-neutral-800">
@@ -25,6 +31,7 @@
                 <tr>
                     <th class="px-4 py-2 text-left text-xs font-medium uppercase tracking-wide text-neutral-500">Domain</th>
                     <th class="px-4 py-2 text-left text-xs font-medium uppercase tracking-wide text-neutral-500">Title</th>
+                    <th class="px-4 py-2 text-left text-xs font-medium uppercase tracking-wide text-neutral-500">Platform</th>
                     <th class="px-4 py-2 text-right text-xs font-medium uppercase tracking-wide text-neutral-500">Matching pages</th>
                 </tr>
             </thead>
@@ -37,15 +44,16 @@
                             </a>
                         </td>
                         <td class="px-4 py-2 text-sm text-neutral-600 dark:text-neutral-400">{{ $site->title ?? '—' }}</td>
+                        <td class="px-4 py-2 text-sm text-neutral-600 dark:text-neutral-400">{{ $site->generator ?? $site->powered_by ?? $site->server ?? '—' }}</td>
                         <td class="px-4 py-2 text-right text-sm text-neutral-600 dark:text-neutral-400">{{ $site->matching_pages_count }}</td>
                     </tr>
                 @empty
                     <tr>
-                        <td colspan="3" class="px-4 py-6 text-center text-sm text-neutral-500">
+                        <td colspan="4" class="px-4 py-6 text-center text-sm text-neutral-500">
                             @if ($hasQuery)
                                 No matching sites.
                             @else
-                                Enter a keyword or TLD to search.
+                                Enter a keyword, TLD, or platform to search.
                             @endif
                         </td>
                     </tr>