✨ feat(connection-modal): 新增SSH私钥文件浏览选择能力

- 新增私钥文件选择入口，减少手动输入路径错误
- 复用系统文件对话框并自动回填私钥路径
- 保留手动输入作为兜底方式
- refs #119

frontend/src/components/ConnectionModal.tsx

@@ -2,7 +2,7 @@ import React, { useState, useEffect, useRef } from 'react';
 import { Modal, Form, Input, InputNumber, Button, message, Checkbox, Divider, Select, Alert, Card, Row, Col, Typography, Collapse, Space, Table, Tag } from 'antd';
 import { DatabaseOutlined, ConsoleSqlOutlined, FileTextOutlined, CloudServerOutlined, AppstoreAddOutlined, CloudOutlined, CheckCircleFilled, CloseCircleFilled } from '@ant-design/icons';
 import { useStore } from '../store';
-import { DBGetDatabases, GetDriverStatusList, MongoDiscoverMembers, TestConnection, RedisConnect } from '../../wailsjs/go/app/App';
+import { DBGetDatabases, GetDriverStatusList, MongoDiscoverMembers, TestConnection, RedisConnect, SelectSSHKeyFile } from '../../wailsjs/go/app/App';
 import { MongoMemberInfo, SavedConnection } from '../types';
 
 const { Meta } = Card;
@@ -71,6 +71,7 @@ const ConnectionModal: React.FC<{
   const [typeSelectWarning, setTypeSelectWarning] = useState<{ driverName: string; reason: string } | null>(null);
   const [driverStatusMap, setDriverStatusMap] = useState<Record<string, DriverStatusSnapshot>>({});
   const [driverStatusLoaded, setDriverStatusLoaded] = useState(false);
+  const [selectingSSHKey, setSelectingSSHKey] = useState(false);
   const testInFlightRef = useRef(false);
   const testTimerRef = useRef<number | null>(null);
   const addConnection = useStore((state) => state.addConnection);
@@ -578,6 +579,30 @@ const ConnectionModal: React.FC<{
       }
   };
 
+  const handleSelectSSHKeyFile = async () => {
+      if (selectingSSHKey) {
+          return;
+      }
+      try {
+          setSelectingSSHKey(true);
+          const currentPath = String(form.getFieldValue('sshKeyPath') || '').trim();
+          const res = await SelectSSHKeyFile(currentPath);
+          if (res?.success) {
+              const data = res.data || {};
+              const selectedPath = typeof data === 'string' ? data : String(data.path || '').trim();
+              if (selectedPath) {
+                  form.setFieldValue('sshKeyPath', selectedPath);
+              }
+          } else if (res?.message !== 'Cancelled') {
+              message.error(`选择私钥文件失败: ${res?.message || '未知错误'}`);
+          }
+      } catch (e: any) {
+          message.error(`选择私钥文件失败: ${e?.message || String(e)}`);
+      } finally {
+          setSelectingSSHKey(false);
+      }
+  };
+
   useEffect(() => {
       if (open) {
           setTestResult(null); // Reset test result
@@ -1493,8 +1518,15 @@ const ConnectionModal: React.FC<{
                             <Input.Password placeholder="密码" />
                         </Form.Item>
                     </div>
-                     <Form.Item name="sshKeyPath" label="私钥路径 (可选)" help="例如: /Users/name/.ssh/id_rsa">
+                    <Form.Item label="私钥路径 (可选)" help="例如: /Users/name/.ssh/id_rsa">
-                        <Input placeholder="绝对路径" />
+                        <Space.Compact style={{ width: '100%' }}>
+                            <Form.Item name="sshKeyPath" noStyle>
+                                <Input placeholder="绝对路径" />
+                            </Form.Item>
+                            <Button onClick={handleSelectSSHKeyFile} loading={selectingSSHKey}>
+                                浏览...
+                            </Button>
+                        </Space.Compact>
                     </Form.Item>
                 </div>
             )}

frontend/wailsjs/go/app/App.d.ts

@@ -156,6 +156,8 @@ export function SelectDriverDownloadDirectory(arg1:string):Promise<connection.Qu
 
 export function SelectDriverPackageFile(arg1:string):Promise<connection.QueryResult>;
 
+export function SelectSSHKeyFile(arg1:string):Promise<connection.QueryResult>;
+
 export function SetWindowTranslucency(arg1:number,arg2:number):Promise<void>;
 
 export function TestConnection(arg1:connection.ConnectionConfig):Promise<connection.QueryResult>;

frontend/wailsjs/go/app/App.js

@@ -306,6 +306,10 @@ export function SelectDriverPackageFile(arg1) {
   return window['go']['app']['App']['SelectDriverPackageFile'](arg1);
 }
 
+export function SelectSSHKeyFile(arg1) {
+  return window['go']['app']['App']['SelectSSHKeyFile'](arg1);
+}
+
 export function SetWindowTranslucency(arg1, arg2) {
   return window['go']['app']['App']['SetWindowTranslucency'](arg1, arg2);
 }

internal/app/methods_file.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"math"
 	"os"
+	"path/filepath"
 	"sort"
 	"strconv"
 	"strings"
@@ -77,6 +78,48 @@ func (a *App) ImportConfigFile() connection.QueryResult {
 	return connection.QueryResult{Success: true, Data: string(content)}
 }
 
+func (a *App) SelectSSHKeyFile(currentPath string) connection.QueryResult {
+	defaultDir := strings.TrimSpace(currentPath)
+	if defaultDir == "" {
+		if home, err := os.UserHomeDir(); err == nil {
+			defaultDir = filepath.Join(home, ".ssh")
+		}
+	}
+	if filepath.Ext(defaultDir) != "" {
+		defaultDir = filepath.Dir(defaultDir)
+	}
+	if defaultDir != "" && !filepath.IsAbs(defaultDir) {
+		if abs, err := filepath.Abs(defaultDir); err == nil {
+			defaultDir = abs
+		}
+	}
+
+	selection, err := runtime.OpenFileDialog(a.ctx, runtime.OpenDialogOptions{
+		Title:            "选择 SSH 私钥文件",
+		DefaultDirectory: defaultDir,
+		Filters: []runtime.FileFilter{
+			{
+				DisplayName: "私钥文件",
+				Pattern:     "*.pem;*.key;*.ppk;*id_rsa*",
+			},
+			{
+				DisplayName: "所有文件",
+				Pattern:     "*",
+			},
+		},
+	})
+	if err != nil {
+		return connection.QueryResult{Success: false, Message: err.Error()}
+	}
+	if strings.TrimSpace(selection) == "" {
+		return connection.QueryResult{Success: false, Message: "Cancelled"}
+	}
+	if abs, err := filepath.Abs(selection); err == nil {
+		selection = abs
+	}
+	return connection.QueryResult{Success: true, Data: map[string]interface{}{"path": selection}}
+}
+
 // PreviewImportFile 解析导入文件，返回字段列表、总行数、前 5 行预览数据
 func (a *App) PreviewImportFile(filePath string) connection.QueryResult {
 	if filePath == "" {