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/infra/database/clickhouse.go

@@ -5,6 +5,7 @@
 package database
 
 import (
+	"Wavelet/pkg/config"
 	"context"
 	"fmt"
 	"log"
@@ -19,8 +20,6 @@ import (
 	clickhouseDriver "gorm.io/driver/clickhouse"
 	"gorm.io/gorm"
 	"gorm.io/plugin/opentelemetry/tracing"
-
-	"Wavelet/pkg/config"
 )
 
 const (

backend/plugins/infra/database/plugin.go

@@ -5,12 +5,11 @@
 package database
 
 import (
+	"Wavelet/core"
+	"Wavelet/core/contracts"
 	"context"
 
 	"gorm.io/gorm"
-
-	"Wavelet/core"
-	"Wavelet/core/contracts"
 )
 
 // Option configures the database plugin.

backend/plugins/infra/database/plugin_test.go

@@ -4,6 +4,9 @@
 package database_test
 
 import (
+	"Wavelet/core"
+	"Wavelet/core/contracts"
+	"Wavelet/plugins/infra/database"
 	"context"
 	"path/filepath"
 	"testing"
@@ -12,10 +15,6 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"gorm.io/gorm"
-
-	"Wavelet/core"
-	"Wavelet/core/contracts"
-	"Wavelet/plugins/infra/database"
 )
 
 type Item struct {

backend/plugins/infra/database/postgres.go

@@ -4,6 +4,7 @@
 package database
 
 import (
+	"Wavelet/pkg/config"
 	"context"
 	"fmt"
 	"log"
@@ -21,13 +22,9 @@ import (
 	"gorm.io/gorm"
 	"gorm.io/plugin/dbresolver"
 	"gorm.io/plugin/opentelemetry/tracing"
-
-	"Wavelet/pkg/config"
 )
 
-var (
-	db *gorm.DB
-)
+var db *gorm.DB
 
 // InitDB 初始化主数据库实例（支持 PostgreSQL / SQLite）
 func InitDB() (*gorm.DB, error) {
@@ -46,7 +43,7 @@ func initSQLite() (*gorm.DB, error) {
 
 	if sqlitePath != ":memory:" && !strings.HasPrefix(sqlitePath, "file:") {
 		if dir := filepath.Dir(sqlitePath); dir != "" && dir != "." {
-			if err := os.MkdirAll(dir, 0755); err != nil {
+			if err := os.MkdirAll(dir, 0o755); err != nil {
 				return nil, fmt.Errorf("create sqlite directory %q failed: %w", dir, err)
 			}
 		}

backend/plugins/infra/database/postgres_logger.go

@@ -4,6 +4,7 @@
 package database
 
 import (
+	"Wavelet/pkg/logger"
 	"context"
 	"errors"
 	"fmt"
@@ -12,8 +13,6 @@ import (
 
 	"gorm.io/gorm"
 	gormLogger "gorm.io/gorm/logger"
-
-	"Wavelet/pkg/logger"
 )
 
 // nanoToMilli 纳秒转毫秒的除数