refactor: unify code formatting and improve push/search implementations

- Remove BOM from all Go source files
- Standardize import ordering and whitespace across handlers and services
- Replace PostgreSQL full-text search with ILIKE pattern matching in post and user repositories
- Enhance JPush client with TLS transport, rate limit monitoring, and simplified API
- Refactor PushService to include userID in device management methods
- Add MaxDevicesPerUser limit and extract helper functions for push payload construction

internal/service/chat_service.go

@@ -1,4 +1,4 @@
-package service
+package service
 
 import (
 	"context"
@@ -27,7 +27,7 @@ type ChatService interface {
 	GetConversationList(ctx context.Context, userID string, page, pageSize int) ([]*model.Conversation, int64, error)
 	GetConversationByID(ctx context.Context, conversationID string, userID string) (*model.Conversation, error)
 	DeleteConversationForSelf(ctx context.Context, conversationID string, userID string) error
-SetConversationPinned(ctx context.Context, conversationID string, userID string, isPinned bool) error
+	SetConversationPinned(ctx context.Context, conversationID string, userID string, isPinned bool) error
 	SetConversationNotificationMuted(ctx context.Context, conversationID string, userID string, notificationMuted bool) error
 
 	// 消息操作