feat(proxy): HTTP/SOCKS5 代理支持，按会话独立配置 | 15 files +483/-23 | 96/96 tests passing

功能:
- 代理类型定义 (ProxyType, ProxyConfig)
- 代理工具函数 (验证、解析、构建URL) + 24 测试
- SSH 连接通过 HTTP CONNECT / SOCKS5 隧道
- 数据库 proxy 列持久化 (JSON)
- SessionDialog 代理配置 UI (可折叠面板)
- 连接池传递 proxy 到 IPC
- sessionStore 类型添加 proxy 支持

src/stores/connection/poolStore.ts

@@ -142,6 +142,7 @@ export const usePoolStore = create<PoolState>((set, get) => ({
         password: config.password,
         privateKey: config.privateKey,
         passphrase: config.passphrase,
+        proxy: config.proxy,
       })
       console.log('>>> sshConnect result:', result)
 

src/stores/connection/sessionHelper.ts

@@ -27,6 +27,7 @@ export async function getSessionConfig(sessionId: string): Promise<ConnectionCon
       privateKey: session.privateKey,
       passphrase: session.passphrase,
       authType: session.authType,
+      proxy: session.proxy,
     }
   } catch (error) {
     logger.error('Failed to get session config:', error)

src/stores/sessionStore.ts

@@ -17,6 +17,13 @@ export interface Session {
   password?: string
   privateKey?: string
   passphrase?: string
+  proxy?: {
+    type: 'none' | 'http' | 'socks5'
+    host: string
+    port: number
+    username?: string
+    password?: string
+  }
   group?: string
   tags?: string[]
 }