fix: golangci-lint 零告警通过 (57→0) + gofumpt/goimports 全量格式化

## CI 修复 (P0/P1)

P0 — 编译阻塞:
  - interfaces.go: postUseCase ISP 接口移除不用的 Create/Update/Delete

P1 — 必须修复:
  - ST1000: 为 13 个包添加包注释 (common/config/model/service/...)
  - ST1005: redis_store.go 全部错误消息改为小写开头
  - errcheck (19处): defer Close()→闭包忽略, notifier.Create→_=, r.Run→检查error
  - errorlint (9处): switch-on-error→errors.Is 链, ==→errors.Is
  - ST1020/ST1022: 导出符号注释以符号名开头

P2 — 安全评审:
  - gosec (12处): G203/G301/G304/G306 添加 nolint 注释并附理由

P3 — 清理:
  - unused: 移除 hasUnicode/energyStore/current/energyAdminUseCase
  - gofumpt + goimports 全量格式化 (35+ 文件)

internal/session/fallback_store.go

@@ -168,14 +168,6 @@ func (fs *FallbackStore) ping() bool {
 	return fs.client.Ping(ctx).Err() == nil
 }
 
-// current 返回当前应使用的 Store：Redis 健康用 Redis，否则用 Memory
-func (fs *FallbackStore) current() Store {
-	if fs.healthy.Load() {
-		return fs.redis
-	}
-	return fs.memory
-}
-
 // ---- Store 接口实现（Redis 操作失败时立即降级到内存）----
 // 不依赖周期性健康检查，操作级故障即时响应
 

internal/session/manager.go

@@ -70,7 +70,7 @@ func (m *Manager) Validate(sid string) (*Session, error) {
 	user, err := m.userRepo.FindByIDForAuth(s.UserID)
 	if err != nil {
 		log.Printf("[SessionManager] Validate: user not found uid=%d err=%v", s.UserID, err)
-		m.store.Delete(sid)
+		_ = m.store.Delete(sid)
 		return nil, nil
 	}
 

internal/session/memory_store.go

@@ -39,7 +39,7 @@ func (ms *MemoryStore) Get(id string) (*Session, error) {
 		timeout = ms.rememberTimeout
 	}
 	if s.IsExpired(timeout) {
-		ms.Delete(id)
+		_ = ms.Delete(id)
 		return nil, nil
 	}
 	return s, nil

internal/session/redis_store.go

@@ -3,6 +3,7 @@ package session
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"log"
 	"time"
@@ -51,16 +52,16 @@ func (rs *RedisStore) sessionKeys(sids []string) []string {
 func (rs *RedisStore) Get(id string) (*Session, error) {
 	ctx := context.Background()
 	data, err := rs.client.Get(ctx, keyPrefix+id).Bytes()
-	if err == redis.Nil {
+	if errors.Is(err, redis.Nil) {
 		return nil, nil
 	}
 	if err != nil {
-		return nil, fmt.Errorf("Redis GET session: %w", err)
+		return nil, fmt.Errorf("redis GET session: %w", err)
 	}
 
 	var s Session
 	if err := json.Unmarshal(data, &s); err != nil {
-		return nil, fmt.Errorf("Redis 反序列化 session: %w", err)
+		return nil, fmt.Errorf("redis 反序列化 session: %w", err)
 	}
 	return &s, nil
 }
@@ -71,7 +72,7 @@ func (rs *RedisStore) Set(s *Session) error {
 
 	data, err := json.Marshal(s)
 	if err != nil {
-		return fmt.Errorf("Redis 序列化 session: %w", err)
+		return fmt.Errorf("redis 序列化 session: %w", err)
 	}
 
 	ttl := rs.idleTimeout
@@ -91,7 +92,7 @@ func (rs *RedisStore) Set(s *Session) error {
 
 	_, err = pipe.Exec(ctx)
 	if err != nil {
-		return fmt.Errorf("Redis SET session: %w", err)
+		return fmt.Errorf("redis SET session: %w", err)
 	}
 	return nil
 }
@@ -102,11 +103,11 @@ func (rs *RedisStore) Delete(id string) error {
 
 	// 先读取 session 获取 UserID，再从集合中移除
 	data, err := rs.client.Get(ctx, keyPrefix+id).Bytes()
-	if err == redis.Nil {
+	if errors.Is(err, redis.Nil) {
 		return nil
 	}
 	if err != nil {
-		return fmt.Errorf("Redis GET session for delete: %w", err)
+		return fmt.Errorf("redis GET session for delete: %w", err)
 	}
 
 	var s Session
@@ -126,7 +127,7 @@ func (rs *RedisStore) DeleteByUID(uid uint) error {
 
 	sids, err := rs.client.SMembers(ctx, uidKey).Result()
 	if err != nil {
-		return fmt.Errorf("Redis SMEMBERS user_sessions: %w", err)
+		return fmt.Errorf("redis SMEMBERS user_sessions: %w", err)
 	}
 
 	if len(sids) == 0 {
@@ -138,7 +139,7 @@ func (rs *RedisStore) DeleteByUID(uid uint) error {
 	pipe.Del(ctx, uidKey)
 	_, err = pipe.Exec(ctx)
 	if err != nil {
-		return fmt.Errorf("Redis DeleteByUID: %w", err)
+		return fmt.Errorf("redis DeleteByUID: %w", err)
 	}
 
 	log.Printf("[RedisStore] DeleteByUID uid=%d count=%d", uid, len(sids))
@@ -152,7 +153,7 @@ func (rs *RedisStore) DeleteByUIDExclude(uid uint, excludeSID string) error {
 
 	sids, err := rs.client.SMembers(ctx, uidKey).Result()
 	if err != nil {
-		return fmt.Errorf("Redis SMEMBERS user_sessions: %w", err)
+		return fmt.Errorf("redis SMEMBERS user_sessions: %w", err)
 	}
 
 	var toDelete []string
@@ -176,7 +177,7 @@ func (rs *RedisStore) DeleteByUIDExclude(uid uint, excludeSID string) error {
 	}
 	_, err = pipe.Exec(ctx)
 	if err != nil {
-		return fmt.Errorf("Redis DeleteByUIDExclude: %w", err)
+		return fmt.Errorf("redis DeleteByUIDExclude: %w", err)
 	}
 
 	log.Printf("[RedisStore] DeleteByUIDExclude uid=%d removed=%d kept=%d", uid, len(toDelete), kept)
@@ -190,7 +191,7 @@ func (rs *RedisStore) ListByUID(uid uint) ([]*Session, error) {
 
 	sids, err := rs.client.SMembers(ctx, uidKey).Result()
 	if err != nil {
-		return nil, fmt.Errorf("Redis SMEMBERS user_sessions: %w", err)
+		return nil, fmt.Errorf("redis SMEMBERS user_sessions: %w", err)
 	}
 
 	if len(sids) == 0 {
@@ -199,7 +200,7 @@ func (rs *RedisStore) ListByUID(uid uint) ([]*Session, error) {
 
 	results, err := rs.client.MGet(ctx, rs.sessionKeys(sids)...).Result()
 	if err != nil {
-		return nil, fmt.Errorf("Redis MGET sessions: %w", err)
+		return nil, fmt.Errorf("redis MGET sessions: %w", err)
 	}
 
 	var sessions []*Session

internal/session/store.go

@@ -1,3 +1,4 @@
+// Package session 提供服务端会话管理：创建、验证、销毁、Redis/内存双存储及自动降级。
 package session
 
 // StoreMetrics 存储状态信息（供管理面板展示）