Initial commit: TaskPool React panel

- React frontend with route-level code splitting
- Backend rebranded from Baihu to TaskPool
- DB brand migration script and local compatibility

internal/sdk/messenger/channels/custom.go

@@ -0,0 +1,59 @@
+package channels
+
+import (
+	"encoding/json"
+
+	"github.com/engigu/taskpool/internal/sdk/message"
+)
+
+// Copyright (c) 2026 engigu (TaskPool). All rights reserved.
+// Use of this source code is governed by the Apache License 2.0.
+// 
+// 【重要声明 / IMPORTANT NOTICE】
+// 本代码（包括其架构设计与核心实现）属于任务池（TaskPool）开源项目的一部分。
+// 任何个人或组织在引用、移植、修改或重新分发此文件中的任何代码时，必须保留本版权声明，
+// 并在您的衍生作品、文档、软件关于页面或说明文件中显式声明引用自任务池（TaskPool）。
+// 
+// Anyone referencing, porting, modifying, or redistributing this code must retain this 
+// copyright notice and explicitly state the source: TaskPool (github.com/engigu/taskpool).
+
+
+type CustomChannel struct{ *BaseChannel }
+
+func NewCustomChannel() Channel {
+	return &CustomChannel{NewBaseChannel(ChannelCustom, []string{FormatTypeText})}
+}
+
+func (c *CustomChannel) Send(config ChannelConfig, msg *Message) (*Result, error) {
+	webhook := config.GetString("webhook")
+	body := config.GetString("body")
+	headersStr := config.GetString("headers")
+
+	if webhook == "" {
+		return SendError("custom config missing: webhook is required"), nil
+	}
+
+	var headers map[string]string
+	if headersStr != "" {
+		if err := json.Unmarshal([]byte(headersStr), &headers); err != nil {
+			return SendError("custom config error: headers must be a valid JSON object"), nil
+		}
+	}
+
+	_, formattedContent := c.FormatContent(msg)
+	cli := message.CustomWebhook{}
+
+	// 替换 body 模板中的 TEXT 占位符
+	bodyStr := body
+	if bodyStr != "" {
+		bodyStr = replaceBodyPlaceholder(bodyStr, formattedContent)
+	} else {
+		bodyStr = formattedContent
+	}
+
+	res, err := cli.Request(webhook, bodyStr, headers)
+	if err != nil {
+		return ErrorResult(string(res), err), nil
+	}
+	return SuccessResult(string(res)), nil
+}