refactor(repo): consolidate openflare-server to root and move subprojects to internal/apps

- Merge all files inside openflare-server to the repository root directory.
- Relocate agent, relay, and flared subprojects from internal/ to internal/apps/.
- Combine docker-compose files and update build context paths to root.
- Update GitHub workflows and Dockerfiles to refer to new directories and package names.
- Rewrite Go package imports across all files.
- Resolve database renew test race condition and clean up docs.

internal/db/migrator/clickhouse_test.go

@@ -0,0 +1,55 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package migrator
+
+import (
+	"testing"
+
+	"github.com/Rain-kl/Wavelet/internal/config"
+	"github.com/pressly/goose/v3"
+)
+
+func TestClickHouseMigrationFilesEmbedded(t *testing.T) {
+	entries, err := clickhouseMigrationFS.ReadDir(clickhouseMigrationDir)
+	if err != nil {
+		t.Fatalf("ReadDir(%q) error = %v", clickhouseMigrationDir, err)
+	}
+	if len(entries) == 0 {
+		t.Fatal("expected embedded ClickHouse migrations, got none")
+	}
+
+	expected := map[string]bool{
+		"202606190001_create_user_access_logs.sql": false,
+		"202606200001_create_node_access_logs.sql": false,
+	}
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+		if _, ok := expected[entry.Name()]; ok {
+			expected[entry.Name()] = true
+		}
+	}
+	for name, found := range expected {
+		if !found {
+			t.Fatalf("expected %s in embedded migrations", name)
+		}
+	}
+}
+
+func TestClickHouseGooseDialect(t *testing.T) {
+	if err := goose.SetDialect("clickhouse"); err != nil {
+		t.Fatalf("SetDialect(clickhouse) error = %v", err)
+	}
+}
+
+func TestMigrateClickHouseSkipsWhenDisabled(t *testing.T) {
+	previousEnabled := config.Config.ClickHouse.Enabled
+	config.Config.ClickHouse.Enabled = false
+	t.Cleanup(func() {
+		config.Config.ClickHouse.Enabled = previousEnabled
+	})
+
+	MigrateClickHouse()
+}