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

panel/main.py

@@ -128,6 +128,7 @@ async def login(request: Request):
     if verify_admin(username, password):
         response = RedirectResponse(url="/dashboard", status_code=status.HTTP_303_SEE_OTHER)
         response.set_cookie(key="auth", value="ok", httponly=True)
+        response.set_cookie(key="username", value=username, httponly=True)
         return response
     
     return templates.TemplateResponse("login.html", {
@@ -140,10 +141,12 @@ async def dashboard(request: Request):
     if request.cookies.get("auth") != "ok":
         return RedirectResponse(url="/login")
     
+    username = request.cookies.get("username", "")
     config = get_config()
     return templates.TemplateResponse("dashboard.html", {
         "request": request,
-        "config": config
+        "config": config,
+        "username": username
     })
 
 @app.get("/config")
@@ -151,10 +154,12 @@ async def config_page(request: Request):
     if request.cookies.get("auth") != "ok":
         return RedirectResponse(url="/login")
     
+    username = request.cookies.get("username", "")
     config = get_config()
     return templates.TemplateResponse("config.html", {
         "request": request,
-        "config": config
+        "config": config,
+        "username": username
     })
 
 @app.get("/languages")
@@ -248,6 +253,7 @@ async def update_language_flags(request: Request):
 async def logout():
     response = RedirectResponse(url="/login", status_code=status.HTTP_303_SEE_OTHER)
     response.delete_cookie("auth")
+    response.delete_cookie("username")
     return response
 
 @app.get("/admins")
@@ -316,6 +322,81 @@ async def update_admin_post(request: Request):
             
     return RedirectResponse(url="/admins?success=1", status_code=status.HTTP_303_SEE_OTHER)
 
+@app.get("/welcome")
+async def welcome_page(request: Request):
+    if request.cookies.get("auth") != "ok":
+        return RedirectResponse(url="/login")
+    
+    from botdiscord.database import get_all_welcome_configs
+    
+    configs = get_all_welcome_configs()
+    config_dict = {c['guild_id']: c for c in configs} if configs else {}
+    
+    selected_guild = request.query_params.get("guild")
+    selected_cfg = None
+    if selected_guild and selected_guild.isdigit():
+        selected_cfg = config_dict.get(int(selected_guild))
+    
+    success = request.query_params.get("success") == "1"
+    error = request.query_params.get("error") == "1"
+    
+    return templates.TemplateResponse("welcome.html", {
+        "request": request,
+        "configs": config_dict,
+        "config": config_dict,
+        "selected_guild": int(selected_guild) if selected_guild and selected_guild.isdigit() else None,
+        "selected_cfg": selected_cfg,
+        "success": success,
+        "error": error,
+        "new_form": request.query_params.get("new") == "1"
+    })
+
+@app.post("/welcome/save")
+async def save_welcome(request: Request):
+    if request.cookies.get("auth") != "ok":
+        raise HTTPException(status_code=401)
+    
+    form = await request.form()
+    guild_id = form.get("guild_id")
+    channel_id = form.get("channel_id")
+    message_content = form.get("message_content")
+    enabled = form.get("enabled") == "1"
+    
+    if not guild_id or not channel_id or not message_content:
+        return RedirectResponse(url="/welcome?error=1", status_code=status.HTTP_303_SEE_OTHER)
+    
+    try:
+        from botdiscord.database import save_welcome_message
+        save_welcome_message(
+            int(guild_id),
+            int(channel_id),
+            message_content,
+            enabled
+        )
+        return RedirectResponse(url="/welcome?success=1", status_code=status.HTTP_303_SEE_OTHER)
+    except Exception as e:
+        print(f"Error saving welcome message: {e}")
+        return RedirectResponse(url="/welcome?error=1", status_code=status.HTTP_303_SEE_OTHER)
+
+@app.post("/welcome/delete")
+async def delete_welcome(request: Request):
+    if request.cookies.get("auth") != "ok":
+        raise HTTPException(status_code=401)
+    
+    form = await request.form()
+    guild_id = form.get("guild_id")
+    
+    if guild_id:
+        try:
+            from botdiscord.database import delete_welcome_message
+            delete_welcome_message(int(guild_id))
+            return RedirectResponse(url="/welcome?success=1", status_code=status.HTTP_303_SEE_OTHER)
+        except Exception as e:
+            print(f"Error deleting welcome message: {e}")
+            return RedirectResponse(url="/welcome?error=1", status_code=status.HTTP_303_SEE_OTHER)
+    
+    return RedirectResponse(url="/welcome", status_code=status.HTTP_303_SEE_OTHER)
+
 if __name__ == "__main__":
     import uvicorn
     web_config = get_web_config()