refactor(module): simplify module name to Wavelet and standardize import paths

- Declared module Wavelet in backend/go.mod
- Replaced github.com/Rain-kl/Wavelet/ with clean Wavelet/ import paths across backend codebase
- Updated architecture guards, Makefile, swagger, and build tests
- 100% passed all tests, lint checks, and binary compilation

backend/plugins/domain/message_gateway/channels/qq/adapter.go

@@ -11,8 +11,8 @@ import (
 	"sync"
 	"time"
 
-	"github.com/Rain-kl/Wavelet/pkg/logger"
-	"github.com/Rain-kl/Wavelet/plugins/domain/message_gateway"
+	"Wavelet/pkg/logger"
+	"Wavelet/plugins/domain/message_gateway"
 	"github.com/tencent-connect/botgo"
 	"github.com/tencent-connect/botgo/dto"
 	"github.com/tencent-connect/botgo/event"

backend/plugins/domain/message_gateway/channels/qq/adapter_test.go

@@ -7,7 +7,7 @@ import (
 	"context"
 	"testing"
 
-	"github.com/Rain-kl/Wavelet/plugins/domain/message_gateway"
+	"Wavelet/plugins/domain/message_gateway"
 )
 
 func TestHandleEvent_DropsNonC2C(t *testing.T) {

backend/plugins/domain/message_gateway/channels/telegram/adapter.go

@@ -12,7 +12,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/Rain-kl/Wavelet/plugins/domain/message_gateway"
+	"Wavelet/plugins/domain/message_gateway"
 	tele "gopkg.in/telebot.v4"
 )
 

backend/plugins/domain/message_gateway/channels/telegram/adapter_test.go

@@ -7,7 +7,7 @@ import (
 	"context"
 	"testing"
 
-	"github.com/Rain-kl/Wavelet/plugins/domain/message_gateway"
+	"Wavelet/plugins/domain/message_gateway"
 	tele "gopkg.in/telebot.v4"
 )