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/apps/config/routers_test.go

@@ -0,0 +1,70 @@
+// Copyright 2025 linux.do
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package config
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/Rain-kl/Wavelet/internal/model"
+	"github.com/Rain-kl/Wavelet/internal/testhelper"
+	"github.com/gin-gonic/gin"
+
+	"github.com/Rain-kl/Wavelet/internal/common/response"
+)
+
+func TestGetPublicConfigUsesVisibility(t *testing.T) {
+	dbConn, _, cleanup := testhelper.SetupTestEnvironment(t)
+	defer cleanup()
+
+	if err := dbConn.Create(&model.SystemConfig{
+		Key:         "custom_public_key",
+		Value:       "custom_public_value",
+		Type:        "system",
+		Visibility:  model.ConfigVisibilityVisible,
+		Description: "custom public config",
+	}).Error; err != nil {
+		t.Fatalf("Create(custom_public_key) error = %v", err)
+	}
+	if err := dbConn.Model(&model.SystemConfig{}).
+		Where("key = ?", model.ConfigKeySiteName).
+		Update("visibility", model.ConfigVisibilityHidden).Error; err != nil {
+		t.Fatalf("Update(%s.visibility) error = %v", model.ConfigKeySiteName, err)
+	}
+
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	router.GET("/api/v1/config/public", GetPublicConfig)
+
+	req := httptest.NewRequest(http.MethodGet, "/api/v1/config/public", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("GetPublicConfig() status = %d, want %d; body = %s", w.Code, http.StatusOK, w.Body.String())
+	}
+
+	var resp response.Any
+	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
+		t.Fatalf("json.Unmarshal(GetPublicConfig()) error = %v", err)
+	}
+	dataBytes, err := json.Marshal(resp.Data)
+	if err != nil {
+		t.Fatalf("json.Marshal(GetPublicConfig().data) error = %v", err)
+	}
+	var configs map[string]string
+	if err := json.Unmarshal(dataBytes, &configs); err != nil {
+		t.Fatalf("json.Unmarshal(GetPublicConfig().data) error = %v", err)
+	}
+
+	if got := configs["custom_public_key"]; got != "custom_public_value" {
+		t.Errorf("GetPublicConfig()[custom_public_key] = %q, want %q", got, "custom_public_value")
+	}
+	if _, ok := configs[model.ConfigKeySiteName]; ok {
+		t.Errorf("GetPublicConfig()[%s] is present, want hidden", model.ConfigKeySiteName)
+	}
+}