feat: add Go MCP server create API (#15260)

## What
Implementation for POST /api/v1/mcp/servers
#15240

internal/handler/mcp.go

@@ -0,0 +1,65 @@
+//
+//  Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+//
+
+package handler
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"ragflow/internal/common"
+	"ragflow/internal/service"
+)
+
+// MCPHandler handles MCP server requests.
+type MCPHandler struct {
+	mcpService *service.MCPService
+}
+
+// NewMCPHandler creates an MCP handler.
+func NewMCPHandler(mcpService *service.MCPService) *MCPHandler {
+	return &MCPHandler{
+		mcpService: mcpService,
+	}
+}
+
+// CreateMCPServer creates an MCP server for the current user.
+func (h *MCPHandler) CreateMCPServer(c *gin.Context) {
+	user, errorCode, errorMessage := GetUser(c)
+	if errorCode != common.CodeSuccess {
+		jsonError(c, errorCode, errorMessage)
+		return
+	}
+
+	var req service.CreateMCPServerRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		jsonError(c, common.CodeDataError, err.Error())
+		return
+	}
+
+	result, code, err := h.mcpService.CreateMCPServer(user.ID, req)
+	if err != nil {
+		jsonError(c, code, err.Error())
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"code":    common.CodeSuccess,
+		"message": "success",
+		"data":    result,
+	})
+}