feat: Add automatic email signature

supabase/functions/send-admin-email-reply/index.ts

@@ -78,6 +78,20 @@ const handler = async (req: Request): Promise<Response> => {
       return createErrorResponse({ message: 'Submission not found' }, 404, corsHeaders);
     }
 
+    // Fetch email signature from admin settings
+    const { data: signatureSetting } = await supabase
+      .from('admin_settings')
+      .select('setting_value')
+      .eq('setting_key', 'email.signature')
+      .single();
+
+    const emailSignature = signatureSetting?.setting_value?.signature || '';
+    
+    // Append signature to reply body if it exists
+    const finalReplyBody = emailSignature 
+      ? `${replyBody}\n\n---\n${emailSignature}`
+      : replyBody;
+
     // Rate limiting: max 10 replies per hour
     const oneHourAgo = new Date(Date.now() - 60 * 60 * 1000).toISOString();
     const { count } = await supabase
@@ -124,7 +138,7 @@ const handler = async (req: Request): Promise<Response> => {
         from: 'ThrillWiki Admin <admin@thrillwiki.com>',
         to: `${submission.name} <${submission.email}>`,
         subject: finalSubject,
-        text: replyBody,
+        text: finalReplyBody,
         headers: {
           'Message-ID': messageId,
           'In-Reply-To': inReplyTo,
@@ -156,7 +170,7 @@ const handler = async (req: Request): Promise<Response> => {
         from_email: 'admin@thrillwiki.com',
         to_email: submission.email,
         subject: finalSubject,
-        body_text: replyBody,
+        body_text: finalReplyBody,
         direction: 'outbound',
         sent_by: user.id,
         metadata: {