refactor(repo): replace legacy openflare-server with Wavelet rename

Delete the old monolithic openflare-server implementation and rename
Wavelet/ to openflare-server/ to complete the migration consolidation.
Update CI workflows, agent Dockerfiles, and deployment docs for the new
layout (frontend/, docker/Dockerfile).

openflare-server/internal/db/clickhouse.go

@@ -0,0 +1,68 @@
+// Copyright 2025 linux.do
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package db 提供数据库连接与基础设施
+package db
+
+import (
+	"context"
+	"log"
+	"time"
+
+	"github.com/ClickHouse/clickhouse-go/v2"
+	"github.com/ClickHouse/clickhouse-go/v2/lib/driver"
+	"github.com/Rain-kl/Wavelet/internal/config"
+)
+
+const (
+	clickhouseMaxExecTime       = 60 // ClickHouse 最大执行时间（秒）
+	clickhouseReadTimeoutFactor = 2  // ReadTimeout 为 DialTimeout 的倍数
+)
+
+var (
+	// ChConn ClickHouse 连接实例
+	ChConn driver.Conn
+)
+
+func init() {
+	if !config.Config.ClickHouse.Enabled {
+		return
+	}
+
+	cfg := config.Config.ClickHouse
+	var err error
+
+	// 配置 ClickHouse 连接
+	ChConn, err = clickhouse.Open(&clickhouse.Options{
+		Addr: cfg.Hosts,
+		Auth: clickhouse.Auth{
+			Database: cfg.Database,
+			Username: cfg.Username,
+			Password: cfg.Password,
+		},
+		Settings: clickhouse.Settings{
+			"max_execution_time": clickhouseMaxExecTime,
+		},
+		Compression: &clickhouse.Compression{
+			Method: clickhouse.CompressionLZ4,
+		},
+		DialTimeout:     time.Duration(cfg.DialTimeout) * time.Second,
+		MaxOpenConns:    cfg.MaxOpenConn,
+		MaxIdleConns:    cfg.MaxIdleConn,
+		ConnMaxLifetime: time.Duration(cfg.ConnMaxLifetime) * time.Second,
+		ReadTimeout:     time.Duration(cfg.DialTimeout*clickhouseReadTimeoutFactor) * time.Second,
+		BlockBufferSize: cfg.BlockBufferSize,
+	})
+
+	if err != nil {
+		log.Fatalf("[ClickHouse] init connection failed: %v\n", err)
+	}
+
+	// 测试连接
+	if err = ChConn.Ping(context.Background()); err != nil {
+		log.Fatalf("[ClickHouse] ping failed: %v\n", err)
+	}
+
+	log.Println("[ClickHouse] connection established successfully")
+}