feat(ring-groups): allow direct voicemail redirection on no-answer failover

Add vm-<ext> destination support in UI destination picker, API validation, and [app-voicemail] Asterisk dialplan context. Refs #2

src/ConfigGenerator.php

@@ -1686,6 +1686,30 @@ class ConfigGenerator
         $lines[] = " same => n,Hangup()";
         $lines[] = "";
 
+        // 5b. Contexte dédié Dépôt Direct sur Boîte Vocale (Redirection sans sonnerie)
+        $lines[] = "; ===========================================================================";
+        $lines[] = "; DÉPÔT DIRECT SUR BOÎTE VOCALE (REDIRECTION / DÉBORDEMENT)";
+        $lines[] = "; ===========================================================================";
+        $lines[] = "[app-voicemail]";
+        foreach ($extensions as $ext) {
+            $num = trim((string)$ext['extension']);
+            if (empty($ext['voicemail_enabled'])) {
+                continue;
+            }
+            $lines[] = "exten => {$num},1,NoOp(Redirection directe vers messagerie vocale du poste {$num})";
+            $lines[] = " same => n,Set(CHANNEL(language)={$sysLang})";
+            $lines[] = " same => n,Answer()";
+            $lines[] = " same => n,Wait(0.5)";
+            $lines[] = " same => n,VoiceMail({$num}@default,u)";
+            $lines[] = " same => n,Hangup()";
+        }
+        $lines[] = "exten => _X.,1,NoOp(Boite vocale inexistante ou desactivee pour \${EXTEN})";
+        $lines[] = " same => n,Set(CHANNEL(language)={$sysLang})";
+        $lines[] = " same => n,Answer()";
+        $lines[] = " same => n,Playback(vm-incorrect-mailbox)";
+        $lines[] = " same => n,Hangup()";
+        $lines[] = "";
+
         return implode("\n", $lines) . "\n";
     }
 
@@ -2328,6 +2352,17 @@ EOF;
         if (preg_match('/^\d+$/', $dest)) {
             return "Goto(from-internal,{$dest},1)";
         }
+        if (str_starts_with($dest, 'vm-')) {
+            $vmExt = preg_replace('/[^0-9A-Za-z_-]/', '', substr($dest, 3));
+            if ($vmExt !== '') {
+                $stmt = $this->db->prepare('SELECT voicemail_enabled FROM extensions WHERE extension = :ext AND enabled = 1');
+                $stmt->execute([':ext' => $vmExt]);
+                if ($stmt->fetchColumn()) {
+                    return "Goto(app-voicemail,{$vmExt},1)";
+                }
+            }
+            return 'Goto(app-terminate,hangup,1)';
+        }
         if (str_starts_with($dest, 'page-')) {
             $pageExt = substr($dest, 5);
             return "Goto(from-internal,{$pageExt},1)";