Add reply functionality to manual message override with mention control

- Added optional reply message ID field to web UI
- Added radio buttons to control mention/ping behavior in replies
- Updated frontend JavaScript to send reply parameters
- Modified /manual/send and /dm/{user_id}/manual endpoints to support replies
- Fixed async context by moving message fetching inside bot event loop task
- Supports both channel and DM reply functionality

bot/static/index.html

@@ -885,6 +885,24 @@
           <label for="manualUserId">User ID:</label>
           <input type="text" id="manualUserId" placeholder="Enter user ID for DM..." style="width: 100%;" />
         </div>
+
+        <!-- Reply Configuration -->
+        <div style="margin-top: 0.5rem;">
+          <label for="manualReplyMessageId">Reply to Message ID (optional):</label>
+          <input type="text" id="manualReplyMessageId" placeholder="Enter message ID to reply to..." style="width: 100%;" />
+        </div>
+        
+        <div style="margin-top: 0.5rem;">
+          <label style="margin-right: 1rem;">Mention user in reply:</label>
+          <label>
+            <input type="radio" name="manualReplyMention" value="true" checked />
+            Yes (ping user)
+          </label>
+          <label style="margin-left: 1rem;">
+            <input type="radio" name="manualReplyMention" value="false" />
+            No (silent reply)
+          </label>
+        </div>
         
         <button onclick="sendManualMessage()" style="margin-top: 0.5rem;">Send as Miku</button>
         <p id="manualStatus" style="color: green; margin-top: 0.5rem;"></p>
@@ -2347,6 +2365,8 @@ async function sendManualMessage() {
   const message = document.getElementById('manualMessage').value.trim();
   const files = document.getElementById('manualAttachment').files;
   const targetType = document.getElementById('manual-target-type').value;
+  const replyMessageId = document.getElementById('manualReplyMessageId').value.trim();
+  const replyMention = document.querySelector('input[name="manualReplyMention"]:checked').value === 'true';
 
   if (!message) {
     showNotification('Please enter a message', 'error');
@@ -2375,6 +2395,12 @@ async function sendManualMessage() {
     const formData = new FormData();
     formData.append('message', message);
     
+    // Add reply parameters if message ID is provided
+    if (replyMessageId) {
+      formData.append('reply_to_message_id', replyMessageId);
+      formData.append('mention_author', replyMention);
+    }
+    
     if (targetType === 'dm') {
       // For DM, the user_id is in the URL path
       if (files.length > 0) {
@@ -2403,6 +2429,7 @@ async function sendManualMessage() {
       showNotification('Message sent successfully');
       document.getElementById('manualMessage').value = '';
       document.getElementById('manualAttachment').value = ''; // Clear file input
+      document.getElementById('manualReplyMessageId').value = ''; // Clear reply message ID
       if (targetType === 'dm') {
         document.getElementById('manualUserId').value = '';
       } else {