Fix: Mejorar manejo de menciones en traducciones usando placeholders más robustos

- Cambiar formato de placeholder de <m0 /> a 【M0】 (corchetes chinos)
- El traductor ya no altera estos placeholders
- Agregar verificación de placeholders antes de usar caché
- Regenerar traducciones automáticamente si placeholders no coinciden
- Compatible con formatos antiguos de placeholders

botdiscord/bot.py

@@ -94,6 +94,15 @@ async def on_member_join(member):
         )
         
         text_escaped = html.escape(formatted_message)
+        mention_pattern = re.compile(r'<@!?(\d+)>|<@&(\d+)>|<#(\d+)>')
+        welcome_mentions_map = {}
+        
+        def replace_mention(match):
+            placeholder = f"【M{len(welcome_mentions_map)}】"
+            welcome_mentions_map[placeholder] = html.unescape(match.group(0))
+            return placeholder
+        
+        text_to_translate = mention_pattern.sub(replace_mention, text_escaped)
         
         welcome_msg = await channel.send(formatted_message)
         print(f"[WELCOME] Mensaje enviado: {welcome_msg.id}")
@@ -102,8 +111,8 @@ async def on_member_join(member):
             welcome_msg.id,
             member.guild.id,
             member.id,
-            text_escaped,
-            {},
+            text_to_translate,
+            welcome_mentions_map,
             'discord'
         )
         
@@ -153,13 +162,12 @@ async def on_message(message):
     active_codes = get_active_langs_for_guild(message.guild.id)
     if not active_codes: return
 
-    # Escapar y procesar menciones
     text_escaped = html.escape(message.content)
     mention_pattern = re.compile(r'<@!?(\d+)>|<@&(\d+)>|<#(\d+)>')
     mentions_map = {}
     
     def replace_mention(match):
-        placeholder = f"<m{len(mentions_map)} />"
+        placeholder = f"【M{len(mentions_map)}】"
         mentions_map[placeholder] = html.unescape(match.group(0))
         return placeholder