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/handler/message_handler.go

@@ -1,4 +1,4 @@
-package handler
+package handler
 
 import (
 	"context"
@@ -940,7 +940,7 @@ func (h *MessageHandler) HandleSetConversationNotificationMuted(c *gin.Context)
 	}
 
 	response.SuccessWithMessage(c, "conversation notification_muted status updated", gin.H{
-		"conversation_id":     conversationID,
+		"conversation_id":    conversationID,
 		"notification_muted": req.NotificationMuted,
 	})
 }