feat: self-hosted Whisper server support

- MediaTranscriber: if whisper_url set, POSTs to own server with
  Basic auth (audio_file field); falls back to OpenAI cloud Whisper
- Admin AI tab: new section for whisper_url / whisper_user / whisper_pass
- save-ai endpoint: saves the three whisper fields to config_json

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

admin/DashboardController.php

@@ -3170,6 +3170,9 @@ HTML;
         $aiModel35         = $aiModelVal === 'gpt-3.5-turbo'? ' selected' : '';
         $geminiApiKeyVal   = self::h($config['gemini_api_key'] ?? '');
         $geminiModelVal    = $config['gemini_model'] ?? 'gemini-2.5-flash';
+        $whisperUrlVal     = self::h($config['whisper_url']  ?? '');
+        $whisperUserVal    = self::h($config['whisper_user'] ?? '');
+        $whisperPassVal    = self::h($config['whisper_pass'] ?? '');
         $geminiModelF25    = $geminiModelVal === 'gemini-2.5-flash' ? ' selected' : '';
         $geminiModelF20    = $geminiModelVal === 'gemini-2.0-flash' ? ' selected' : '';
         $geminiModelF15    = $geminiModelVal === 'gemini-1.5-flash' ? ' selected' : '';
@@ -3717,6 +3720,26 @@ HTML;
         </div>
       </div>
 
+      <!-- Whisper server (auto-hosted) -->
+      <div class="form-group" style="margin-top:12px;padding:12px;background:#f0f7f0;border:1px solid #c6e0c6;border-radius:8px">
+        <label style="font-weight:600">🎙️ Servidor Whisper propio (transcripción de audio)</label>
+        <div style="font-size:11px;color:#4a5568;margin-bottom:8px">Si se configura, el audio se transcribe aquí en vez del proveedor seleccionado arriba.</div>
+        <div class="form-group">
+          <label>URL del servidor</label>
+          <input type="text" name="whisper_url" value="{$whisperUrlVal}" placeholder="https://whisper.u-s.app/asr">
+        </div>
+        <div class="form-row">
+          <div class="form-group">
+            <label>Usuario</label>
+            <input type="text" name="whisper_user" value="{$whisperUserVal}" placeholder="whisper">
+          </div>
+          <div class="form-group">
+            <label>Contraseña</label>
+            <input type="password" name="whisper_pass" value="{$whisperPassVal}">
+          </div>
+        </div>
+      </div>
+
       <div class="form-row" style="margin-top:4px">
         <div class="form-group">
           <label>Temperatura ({$aiTempVal})</label>
@@ -3862,6 +3885,10 @@ function saveAiConfig() {
   if (oKey) fd.set('openai_api_key', oKey);
   if (gKey) fd.set('gemini_api_key', gKey);
   if (cKey) fd.set('claude_api_key', cKey);
+  fd.set('whisper_url',  qs('input[name="whisper_url"]')?.value  || '');
+  fd.set('whisper_user', qs('input[name="whisper_user"]')?.value || '');
+  const wPass = qs('input[name="whisper_pass"]')?.value || '';
+  if (wPass) fd.set('whisper_pass', wPass);
   if (qs('input[name="ai_for_media"]')?.checked) fd.set('ai_for_media', '1');
   if (qs('input[name="nlu"]')?.checked)          fd.set('nlu', '1');
 

public/index.php

@@ -634,6 +634,13 @@ $routes = [
         $claudeModel = trim($_POST['claude_model'] ?? '');
         if ($claudeModel !== '') $config['claude_model'] = $claudeModel;
 
+        $whisperUrl  = trim($_POST['whisper_url']  ?? '');
+        $config['whisper_url']  = $whisperUrl;
+        $whisperUser = trim($_POST['whisper_user'] ?? '');
+        $config['whisper_user'] = $whisperUser;
+        $whisperPass = trim($_POST['whisper_pass'] ?? '');
+        if ($whisperPass !== '') $config['whisper_pass'] = $whisperPass;
+
         CompanyRepository::save(['id' => $companyId, 'config_json' => json_encode($config, JSON_UNESCAPED_UNICODE)]);
         echo json_encode(['ok' => true]);
         exit;

services/MediaTranscriber.php

@@ -69,13 +69,48 @@ class MediaTranscriber
 
     private static function whisper(string $bytes, string $mime, array $cfg): ?string
     {
-        $apiKey = $cfg['openai_api_key'] ?? env('OPENAI_API_KEY', '');
-        if ($apiKey === '') return null;
-
         $ext     = str_contains($mime, 'ogg') ? 'ogg' : (str_contains($mime, 'mp4') ? 'mp4' : 'ogg');
         $tmpFile = tempnam(sys_get_temp_dir(), 'wa_audio_') . '.' . $ext;
         file_put_contents($tmpFile, $bytes);
 
+        $whisperUrl  = trim($cfg['whisper_url']  ?? '');
+        $whisperUser = trim($cfg['whisper_user'] ?? '');
+        $whisperPass = trim($cfg['whisper_pass'] ?? '');
+        $useOwn      = $whisperUrl !== '';
+
+        if ($useOwn) {
+            $t0 = (int)(microtime(true) * 1000);
+            $ch = curl_init($whisperUrl);
+            $opts = [
+                CURLOPT_POST           => true,
+                CURLOPT_POSTFIELDS     => ['audio_file' => new CURLFile($tmpFile, $mime, 'audio.' . $ext)],
+                CURLOPT_RETURNTRANSFER => true,
+                CURLOPT_TIMEOUT        => 120,
+            ];
+            if ($whisperUser !== '') {
+                $opts[CURLOPT_USERPWD] = "{$whisperUser}:{$whisperPass}";
+            }
+            curl_setopt_array($ch, $opts);
+            $resp = curl_exec($ch);
+            $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+            curl_close($ch);
+            $ms = (int)(microtime(true) * 1000) - $t0;
+            @unlink($tmpFile);
+
+            if ($code !== 200 || !$resp) return null;
+
+            // Respuesta puede ser JSON {"text":"..."} o texto plano
+            $data = json_decode($resp, true);
+            $text = is_array($data) ? trim($data['text'] ?? '') : trim($resp);
+            if ($text === '') return null;
+            AiLogger::log($cfg['__company_id'] ?? null, 'whisper-own', 'whisper', 'transcribe', '[audio]', $text, $ms);
+            return $text;
+        }
+
+        // Fallback: OpenAI cloud Whisper
+        $apiKey = $cfg['openai_api_key'] ?? env('OPENAI_API_KEY', '');
+        if ($apiKey === '') { @unlink($tmpFile); return null; }
+
         $t0 = (int)(microtime(true) * 1000);
         $ch = curl_init('https://api.openai.com/v1/audio/transcriptions');
         curl_setopt_array($ch, [