refactor: replace standard log with zap logger and optimize code patterns

- Migrate all log.Printf/log.Println calls to structured zap logging
- Use cmp.Or for cleaner default value handling
- Replace manual loops with slices.ContainsFunc/IndexFunc
- Add batch query methods (IsLikedBatch, IsFavoritedBatch) to solve N+1 problem
- Update JSON tags from omitempty to omitzero for numeric fields
- Use errgroup-style wg.Go for worker goroutines
- Remove duplicate casbin/v2 dependency (keeping v3)
- Add plans/ to gitignore

internal/pkg/gorse/embedding.go

@@ -5,9 +5,10 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"log"
 	"net/http"
 	"time"
+
+	"go.uber.org/zap"
 )
 
 // EmbeddingConfig embedding服务配置
@@ -94,7 +95,7 @@ func GetEmbedding(text string) ([]float64, error) {
 // InitEmbeddingWithConfig 从应用配置初始化embedding
 func InitEmbeddingWithConfig(apiKey, url, model string) {
 	if apiKey == "" {
-		log.Println("[WARN] Gorse embedding API key not set, using default")
+		zap.L().Warn("Gorse embedding API key not set, using default")
 	}
 	defaultEmbeddingConfig.APIKey = apiKey
 	if url != "" {
@@ -103,4 +104,4 @@ func InitEmbeddingWithConfig(apiKey, url, model string) {
 	if model != "" {
 		defaultEmbeddingConfig.Model = model
 	}
-}
+}