refactor(log): migrate from zerolog to structured slog with bridge

- Replace direct zerolog usage with standard library `log/slog` in business code
- Add `internal/logging` package with zerolog bridge handler for structured output
- Create `internal/jsoncodec` package to centralize JSON encoding/decoding using Sonic
- Update all services and main entry point to use new logging interface
- Maintain backward compatibility with existing zerolog console output
- Remove custom logger setup in favor of structured logging bridge

internal/service/logger.go

@@ -2,10 +2,10 @@ package service
 
 import (
 	"context"
+	"log/slog"
 	"time"
 
 	"github.com/ez-api/ez-api/internal/model"
-	"github.com/rs/zerolog/log"
 	"gorm.io/gorm"
 )
 
@@ -47,7 +47,7 @@ func (w *LogWriter) Start(ctx context.Context) {
 				return
 			}
 			if err := w.db.Create(&buf).Error; err != nil {
-				log.Error().Err(err).Msg("log batch insert failed")
+				slog.Default().Error("log batch insert failed", "err", err)
 			}
 			buf = buf[:0]
 		}

internal/service/sync.go

@@ -6,7 +6,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/bytedance/sonic"
+	"github.com/ez-api/ez-api/internal/jsoncodec"
 	"github.com/ez-api/ez-api/internal/model"
 	"github.com/ez-api/ez-api/internal/util"
 	"github.com/redis/go-redis/v9"
@@ -212,7 +212,7 @@ func (s *SyncService) SyncAll(db *gorm.DB) error {
 		if p.BanUntil != nil {
 			snap.BanUntil = p.BanUntil.UTC().Unix()
 		}
-		payload, err := sonic.Marshal(snap)
+		payload, err := jsoncodec.Marshal(snap)
 		if err != nil {
 			return fmt.Errorf("marshal provider %d: %w", p.ID, err)
 		}
@@ -271,7 +271,7 @@ func (s *SyncService) SyncAll(db *gorm.DB) error {
 			SupportsFIM:        m.SupportsFIM,
 			MaxOutputTokens:    m.MaxOutputTokens,
 		}
-		payload, err := sonic.Marshal(snap)
+		payload, err := jsoncodec.Marshal(snap)
 		if err != nil {
 			return fmt.Errorf("marshal model %s: %w", m.Name, err)
 		}
@@ -286,7 +286,7 @@ func (s *SyncService) SyncAll(db *gorm.DB) error {
 }
 
 func (s *SyncService) hsetJSON(ctx context.Context, key, field string, val interface{}) error {
-	payload, err := sonic.Marshal(val)
+	payload, err := jsoncodec.Marshal(val)
 	if err != nil {
 		return fmt.Errorf("marshal %s:%s: %w", key, field, err)
 	}