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/drivers/driver_asynq_cron/db_helper.go

@@ -4,13 +4,12 @@
 package driver_asynq_cron
 
 import (
+	"Wavelet/core"
+	"Wavelet/core/contracts"
 	"context"
 	"sync"
 
 	"gorm.io/gorm"
-
-	"Wavelet/core"
-	"Wavelet/core/contracts"
 )
 
 var (

backend/plugins/drivers/driver_asynq_cron/plugin.go

@@ -5,6 +5,9 @@
 package driver_asynq_cron
 
 import (
+	"Wavelet/core"
+	"Wavelet/core/contracts"
+	"Wavelet/pkg/config"
 	"context"
 	"embed"
 	"encoding/json"
@@ -13,10 +16,6 @@ import (
 	"time"
 
 	"github.com/hibiken/asynq"
-
-	"Wavelet/core"
-	"Wavelet/core/contracts"
-	"Wavelet/pkg/config"
 )
 
 //go:embed migrations/*/*.sql

backend/plugins/drivers/driver_asynq_cron/scheduler.go

@@ -4,6 +4,8 @@
 package driver_asynq_cron
 
 import (
+	"Wavelet/core/contracts"
+	"Wavelet/pkg/logger"
 	"context"
 	"fmt"
 	"os/signal"
@@ -12,9 +14,6 @@ import (
 	"time"
 
 	"github.com/hibiken/asynq"
-
-	"Wavelet/core/contracts"
-	"Wavelet/pkg/logger"
 )
 
 var (
@@ -153,7 +152,7 @@ func ReloadScheduler() error {
 	return nil
 }
 
-func waitForStop(done <-chan struct{}, signals <-chan struct{}) bool {
+func waitForStop(done, signals <-chan struct{}) bool {
 	select {
 	case <-done:
 		return false