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/dto/segment.go

@@ -3,6 +3,7 @@ package dto
 import (
 	"encoding/json"
 	"fmt"
+	"slices"
 
 	"carrot_bbs/internal/model"
 )
@@ -232,25 +233,27 @@ func ExtractMentionedUsers(segments model.MessageSegments) []string {
 
 // IsAtAll 检查消息是否@了所有人
 func IsAtAll(segments model.MessageSegments) bool {
-	for _, segment := range segments {
+	return slices.ContainsFunc(segments, func(segment model.MessageSegment) bool {
 		if segment.Type == string(SegmentTypeAt) {
 			if userID, ok := segment.Data["user_id"].(string); ok && userID == "all" {
 				return true
 			}
 		}
-	}
-	return false
+		return false
+	})
 }
 
 // GetReplyMessageID 从消息链中获取被回复的消息ID
 // 如果没有回复segment，返回空字符串
 func GetReplyMessageID(segments model.MessageSegments) string {
-	for _, segment := range segments {
-		if segment.Type == string(SegmentTypeReply) {
-			if id, ok := segment.Data["id"].(string); ok {
-				return id
-			}
-		}
+	idx := slices.IndexFunc(segments, func(segment model.MessageSegment) bool {
+		return segment.Type == string(SegmentTypeReply)
+	})
+	if idx == -1 {
+		return ""
+	}
+	if id, ok := segments[idx].Data["id"].(string); ok {
+		return id
 	}
 	return ""
 }
@@ -291,12 +294,9 @@ func BuildSegmentsFromContent(contentType, content string, mediaURL *string) mod
 
 // HasSegmentType 检查消息链中是否包含指定类型的segment
 func HasSegmentType(segments model.MessageSegments, segmentType SegmentType) bool {
-	for _, segment := range segments {
-		if segment.Type == string(segmentType) {
-			return true
-		}
-	}
-	return false
+	return slices.ContainsFunc(segments, func(segment model.MessageSegment) bool {
+		return segment.Type == string(segmentType)
+	})
 }
 
 // GetSegmentsByType 获取消息链中所有指定类型的segment
@@ -313,12 +313,14 @@ func GetSegmentsByType(segments model.MessageSegments, segmentType SegmentType)
 // GetFirstImageURL 获取消息链中第一张图片的URL
 // 如果没有图片，返回空字符串
 func GetFirstImageURL(segments model.MessageSegments) string {
-	for _, segment := range segments {
-		if segment.Type == string(SegmentTypeImage) {
-			if url, ok := segment.Data["url"].(string); ok {
-				return url
-			}
-		}
+	idx := slices.IndexFunc(segments, func(segment model.MessageSegment) bool {
+		return segment.Type == string(SegmentTypeImage)
+	})
+	if idx == -1 {
+		return ""
+	}
+	if url, ok := segments[idx].Data["url"].(string); ok {
+		return url
 	}
 	return ""
 }
@@ -326,13 +328,18 @@ func GetFirstImageURL(segments model.MessageSegments) string {
 // GetFirstMediaURL 获取消息链中第一个媒体文件的URL（图片/视频/语音/文件）
 // 用于兼容旧版本API
 func GetFirstMediaURL(segments model.MessageSegments) string {
-	for _, segment := range segments {
+	idx := slices.IndexFunc(segments, func(segment model.MessageSegment) bool {
 		switch segment.Type {
 		case string(SegmentTypeImage), string(SegmentTypeVideo), string(SegmentTypeVoice), string(SegmentTypeFile):
-			if url, ok := segment.Data["url"].(string); ok {
-				return url
-			}
+			return true
 		}
+		return false
+	})
+	if idx == -1 {
+		return ""
+	}
+	if url, ok := segments[idx].Data["url"].(string); ok {
+		return url
 	}
 	return ""
 }