In this commit, I

• Update resolveCustomOAIUrl function to handle URLs with existing version patterns
• Remove special handling for /v1 to support any version number (v1, v2, v4, etc.)

Related Issue: microsoft/vscode#267616 (comment)

Step to validate:

1. Add the following config to settings.json

	"github.copilot.chat.customOAIModels": {
		"GLM-4.5": {
			"name": "GLM 4.5",
			"url": "https://api.z.ai/api/coding/paas/v4",
			"maxInputTokens": 131200,
			"maxOutputTokens": 96000,
			"requiresAPIKey": true,
			"thinking": true,
			"toolCalling": true,
			"vision": false,
		},
	}

2. After apply this patch, Copilot Chat shouldn't show any error message when works with this model endpoint