chore(lint): unify formatting on golangci-lint fmt (gofumpt), uncap issue reporting, fix gofumpt drift

- make format 现在与 code-check 使用同一格式化器（golangci-lint fmt），消除 goimports -local 与 gofumpt 的格式拉锯
- .golangci.yml 关闭默认 50/3 截断，完整上报所有问题（只增强不弱化）
- 全库 gofumpt 规范化（203 files, 纯格式无行为变更）

backend/plugins/domain/user/handlers.go

@@ -4,6 +4,8 @@
 package user
 
 import (
+	"Wavelet/core/contracts"
+	"Wavelet/pkg/response"
 	"context"
 	"crypto/rand"
 	"crypto/sha256"
@@ -14,9 +16,6 @@ import (
 
 	"github.com/gin-contrib/sessions"
 	"github.com/gin-gonic/gin"
-
-	"Wavelet/core/contracts"
-	"Wavelet/pkg/response"
 )
 
 type loginRequest struct {

backend/plugins/domain/user/models.go

@@ -4,12 +4,10 @@
 package user
 
 import (
+	"Wavelet/pkg/util"
 	"errors"
-
 	"strings"
 	"time"
-
-	"Wavelet/pkg/util"
 )
 
 // AccessToken 个人访问令牌实体

backend/plugins/domain/user/plugin.go

@@ -5,16 +5,15 @@
 package user
 
 import (
+	"Wavelet/core"
+	"Wavelet/core/contracts"
+	"Wavelet/core/extpoints"
 	"context"
 	"embed"
 	"reflect"
 
 	"github.com/gin-gonic/gin"
 	"github.com/hibiken/asynq"
-
-	"Wavelet/core"
-	"Wavelet/core/contracts"
-	"Wavelet/core/extpoints"
 )
 
 //go:embed migrations/*/*.sql

backend/plugins/domain/user/plugin_test.go

@@ -4,6 +4,9 @@
 package user_test
 
 import (
+	"Wavelet/core"
+	"Wavelet/core/contracts"
+	"Wavelet/plugins/domain/user"
 	"context"
 	"path/filepath"
 	"testing"
@@ -13,9 +16,6 @@ import (
 	"github.com/stretchr/testify/require"
 	"gorm.io/gorm"
 
-	"Wavelet/core"
-	"Wavelet/core/contracts"
-	"Wavelet/plugins/domain/user"
 	database "Wavelet/plugins/infra/database"
 )
 

backend/plugins/domain/user/repository.go

@@ -4,15 +4,14 @@
 package user
 
 import (
+	"Wavelet/core"
+	"Wavelet/core/contracts"
+	"Wavelet/pkg/util"
 	"context"
 	"strings"
 	"sync"
 
 	"gorm.io/gorm"
-
-	"Wavelet/core"
-	"Wavelet/core/contracts"
-	"Wavelet/pkg/util"
 )
 
 var (

backend/plugins/domain/user/service.go

@@ -5,6 +5,9 @@
 package user
 
 import (
+	"Wavelet/core"
+	"Wavelet/core/contracts"
+	"Wavelet/pkg/idgen"
 	"context"
 	"errors"
 	"fmt"
@@ -13,10 +16,6 @@ import (
 
 	"gorm.io/gorm"
 
-	"Wavelet/core"
-	"Wavelet/core/contracts"
-	"Wavelet/pkg/idgen"
-
 	pkgu "Wavelet/pkg/util"
 )