fix(docker): make ClickHouse startable on 25.x and reachable from host

Lower merge-tree free-entry thresholds for small background pools, bind
listen_host to 0.0.0.0 for published ports, and allow CLICKHOUSE_ENABLED=true
in tests for live_ch smoke coverage.

scripts/live_ch_smoke/main.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"time"
+
+	"github.com/Rain-kl/Wavelet/internal/apps/openflare/chwriter"
+	"github.com/Rain-kl/Wavelet/internal/db"
+	"github.com/Rain-kl/Wavelet/internal/model"
+)
+
+func main() {
+	if !db.ChConnReady() {
+		fmt.Fprintln(os.Stderr, "ChConn not ready — check config.yaml clickhouse.enabled")
+		os.Exit(1)
+	}
+	ctx := context.Background()
+	chwriter.Init(ctx)
+	now := time.Now().UTC()
+	nodeID := "e2e-app-" + now.Format("150405")
+	if err := model.InsertOpenFlareMetricSnapshot(ctx, &model.OpenFlareMetricSnapshot{
+		NodeID: nodeID, CapturedAt: now, CPUUsagePercent: 41.2,
+		MemoryUsedBytes: 123, MemoryTotalBytes: 1000,
+		StorageUsedBytes: 456, StorageTotalBytes: 2000,
+		DiskReadBytes: 11, DiskWriteBytes: 22, NetworkRxBytes: 33, NetworkTxBytes: 44,
+	}); err != nil {
+		fmt.Fprintln(os.Stderr, "insert:", err)
+		os.Exit(1)
+	}
+	fmt.Println("queued", nodeID)
+	deadline := time.Now().Add(45 * time.Second)
+	for time.Now().Before(deadline) {
+		rows, err := model.ListOpenFlareMetricSnapshotsSince(ctx, nodeID, now.Add(-time.Minute), 5)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, "list:", err)
+			os.Exit(1)
+		}
+		if len(rows) > 0 {
+			fmt.Printf("OK flushed id=%d cpu=%.1f\n", rows[0].ID, rows[0].CPUUsagePercent)
+			latest, err := model.ListOpenFlareLatestMetricSnapshotsSince(ctx, "", now.Add(-time.Hour))
+			if err != nil {
+				fmt.Fprintln(os.Stderr, "latest:", err)
+				os.Exit(1)
+			}
+			ok := false
+			for _, r := range latest {
+				if r != nil && r.NodeID == nodeID {
+					ok = true
+				}
+			}
+			if !ok {
+				fmt.Fprintln(os.Stderr, "FAIL latest-per-node missing node")
+				os.Exit(1)
+			}
+			fmt.Println("OK latest-per-node includes node")
+			for _, s := range chwriter.WriterStats() {
+				fmt.Printf("writer %s running=%v depth=%d drops=%d flush_err=%d\n",
+					s.Name, s.Running, s.Depth, s.Drops, s.FlushErrors)
+			}
+			_ = chwriter.Stop(ctx)
+			return
+		}
+		time.Sleep(2 * time.Second)
+	}
+	fmt.Fprintln(os.Stderr, "FAIL: not flushed within 45s")
+	os.Exit(1)
+}