feat: Añadir sistema de mensajes de bienvenida con traducción para Discord

- Nueva tabla 'welcome_messages' en la base de datos
- Panel web con página de configuración de bienvenida (/welcome)
  - Listar, crear, editar y eliminar mensajes por servidor
  - Vista previa del mensaje
  - Plantillas predefinidas
- Bot Discord:
  - Nuevo intent 'members' para detectar nuevos usuarios
  - Evento on_member_join que envía mensaje de bienvenida
  - Botones de traducción en mensajes de bienvenida
- Actualizada configuración de MySQL en docker-compose.yml
- Añadido logging de debug para traducciones

botdiscord/database.py

@@ -165,6 +165,14 @@ def init_db():
                       password_hash VARCHAR(255) NOT NULL,
                       created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4''')
         
+        cursor.execute('''CREATE TABLE IF NOT EXISTS welcome_messages
+                     (guild_id BIGINT PRIMARY KEY,
+                      channel_id BIGINT NOT NULL,
+                      message_content TEXT NOT NULL,
+                      enabled BOOLEAN DEFAULT TRUE,
+                      created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                      updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4''')
+        
         conn.commit()
         cursor.close()
     else:
@@ -212,6 +220,12 @@ def init_db():
                       username TEXT NOT NULL UNIQUE,
                       password_hash TEXT NOT NULL,
                       created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP)''')
+        
+        c.execute('''CREATE TABLE IF NOT EXISTS welcome_messages
+                     (guild_id INTEGER PRIMARY KEY,
+                      channel_id INTEGER NOT NULL,
+                      message_content TEXT NOT NULL,
+                      enabled INTEGER DEFAULT 1)''')
         conn.commit()
         conn.close()
 
@@ -593,3 +607,95 @@ def update_admin_password(admin_id: int, password_hash: str):
         c.execute("UPDATE admins SET password_hash = ? WHERE id = ?", (password_hash, admin_id))
         conn.commit()
         conn.close()
+
+def save_welcome_message(guild_id: int, channel_id: int, message_content: str, enabled: bool = True):
+    db_type = get_db_type()
+    
+    if db_type == "mysql":
+        conn = get_connection()
+        cursor = conn.cursor()
+        query = """INSERT INTO welcome_messages (guild_id, channel_id, message_content, enabled) 
+                   VALUES (%s, %s, %s, %s) 
+                   ON DUPLICATE KEY UPDATE channel_id = %s, message_content = %s, enabled = %s"""
+        cursor.execute(query, (guild_id, channel_id, message_content, enabled, channel_id, message_content, enabled))
+        conn.commit()
+        cursor.close()
+    else:
+        conn = get_connection()
+        c = conn.cursor()
+        c.execute("""INSERT OR REPLACE INTO welcome_messages (guild_id, channel_id, message_content, enabled) 
+                     VALUES (?, ?, ?, ?)""", (guild_id, channel_id, message_content, 1 if enabled else 0))
+        conn.commit()
+        conn.close()
+
+def get_welcome_message(guild_id: int):
+    db_type = get_db_type()
+    
+    if db_type == "mysql":
+        conn = get_connection()
+        cursor = conn.cursor(dictionary=True)
+        cursor.execute("SELECT channel_id, message_content, enabled FROM welcome_messages WHERE guild_id = %s", (guild_id,))
+        row = cursor.fetchone()
+        cursor.close()
+        if row:
+            return {
+                'channel_id': int(row['channel_id']) if row['channel_id'] else 0,
+                'message_content': row['message_content'] or '',
+                'enabled': bool(row['enabled'])
+            }
+        return None
+    else:
+        conn = get_connection()
+        c = conn.cursor()
+        c.execute("SELECT channel_id, message_content, enabled FROM welcome_messages WHERE guild_id = ?", (guild_id,))
+        row = c.fetchone()
+        conn.close()
+        if row:
+            return {
+                "channel_id": int(row[0]) if row[0] else 0,
+                "message_content": row[1] or '',
+                "enabled": bool(row[2])
+            }
+        return None
+
+def get_all_welcome_configs():
+    db_type = get_db_type()
+    
+    if db_type == "mysql":
+        conn = get_connection()
+        cursor = conn.cursor(dictionary=True)
+        cursor.execute("SELECT guild_id, channel_id, message_content, enabled FROM welcome_messages")
+        rows = cursor.fetchall()
+        cursor.close()
+        result = []
+        for row in rows:
+            result.append({
+                'guild_id': int(row['guild_id']) if row['guild_id'] else 0,
+                'channel_id': int(row['channel_id']) if row['channel_id'] else 0,
+                'message_content': row['message_content'] or '',
+                'enabled': bool(row['enabled'])
+            })
+        return result
+    else:
+        conn = get_connection()
+        c = conn.cursor()
+        c.execute("SELECT guild_id, channel_id, message_content, enabled FROM welcome_messages")
+        rows = [{"guild_id": r[0], "channel_id": r[1], "message_content": r[2], "enabled": bool(r[3])} for r in c.fetchall()]
+        conn.close()
+        return rows
+
+def delete_welcome_message(guild_id: int):
+    db_type = get_db_type()
+    
+    if db_type == "mysql":
+        conn = get_connection()
+        cursor = conn.cursor()
+        cursor.execute("DELETE FROM welcome_messages WHERE guild_id = %s", (guild_id,))
+        conn.commit()
+        cursor.close()
+    else:
+        conn = get_connection()
+        c = conn.cursor()
+        c.execute("DELETE FROM welcome_messages WHERE guild_id = ?", (guild_id,))
+        conn.commit()
+        conn.close()