Add WxOpenMaService support to WxOpenMessageRouter with routeForMa methods

[Copilot]

Problem

The WxOpenMessageRouter class only supported routing messages to WxMpService (公众号) but lacked support for WxOpenMaService (小程序/miniapp). This prevented developers from accessing mini-app specific functionality when handling mini-app messages through the router.

User's original issue:

@Component
public class WxMaAuditHandler extends AbstractWxOpenHandler {
    @Override
    public WxMpXmlOutMessage handle(WxMpXmlMessage wxMessage, Map<String, Object> context, 
                                   WxMpService wxMpService, WxSessionManager sessionManager) {
        // ❌ Problem: No way to access WxOpenMaService for mini-app operations
        // wxOpenService.getWxOpenComponentService().getWxMaServiceByAppid(""); // Missing appid context
    }
}

Solution

Added two new methods to WxOpenMessageRouter that inject WxOpenMaService into the message context:

1. routeForMa(WxMpXmlMessage wxMessage, String appId) - Routes mini-app messages with automatic service injection
2. routeForMa(WxMpXmlMessage wxMessage, Map<String, Object> context, String appId) - Routes with custom context plus service injection

Key Features:

• ✅ Backward Compatible: All existing route() methods unchanged
• ✅ Context Injection: WxOpenMaService available via context.get("wxOpenMaService")
• ✅ Consistent API: Uses same WxMpXmlMessage format as existing methods
• ✅ Minimal Changes: Only 25 lines of new code

Usage

Now developers can access WxOpenMaService in their handlers:

@Override
public WxMpXmlOutMessage handle(WxMpXmlMessage wxMessage, Map<String, Object> context, 
                               WxMpService wxMpService, WxSessionManager sessionManager) {
    
    // ✅ Now can access WxOpenMaService for mini-app operations
    WxOpenMaService maService = (WxOpenMaService) context.get("wxOpenMaService");
    if (maService != null) {
        WxOpenMaQueryAuditResult result = maService.getLatestAuditStatus();
        maService.releaseAudited();
    }
    return null;
}

// Route mini-app messages using the new method
router.routeForMa(message, appId);  // ✨ NEW - injects WxOpenMaService
router.route(message, appId);       // Unchanged - for MP messages

This enables developers to handle mini-app audit events, code submissions, and other mini-app specific operations through the existing router infrastructure.

Fixes #3629.

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