Refactor PacketApi status checks and fix typos

Replaced all usages of PacketApi.available with PacketApi.packetStatus for more accurate status checking. Fixed a typo in getFullQQVesion to getFullQQVersion. Updated plugin_onmessage to fetch and parse messages for a user. These changes improve reliability and consistency in API status handling.

src/onebot/action/packet/GetPacketStatus.ts

@@ -4,7 +4,7 @@ import { ActionName, BaseCheckResult } from '@/onebot/action/router';
 
 export abstract class GetPacketStatusDepends<PT, RT> extends OneBotAction<PT, RT> {
     protected override async check(payload: PT): Promise<BaseCheckResult>{
-        if (!this.core.apis.PacketApi.available) {
+        if (!this.core.apis.PacketApi.packetStatus) {
             return {
                 valid: false,
                 message: 'packetBackend不可用，请参照文档 https://napneko.github.io/config/advanced 和启动日志检查packetBackend状态或进行配置！' +