fix(environments): allow deleting disconnected environments

Signed-off-by: Solaris-star <820622658@qq.com>

tests/environment-delete.test.ts

@@ -0,0 +1,43 @@
+import assert from 'node:assert/strict';
+import { describe, it } from 'node:test';
+import { fetchEnvironmentDeleteCounts } from '../src/lib/utils/environment-delete';
+
+describe('fetchEnvironmentDeleteCounts', () => {
+	it('returns stack counts when both endpoints respond', async () => {
+		const result = await fetchEnvironmentDeleteCounts(42, async (url) => {
+			return new Response(JSON.stringify(url.includes('/api/git/') ? [{}, {}] : [{}]));
+		});
+
+		assert.deepEqual(result, {
+			stackCount: 1,
+			gitStackCount: 2,
+			unknown: false
+		});
+	});
+
+	it('fails closed when a disconnected endpoint rejects', async () => {
+		const result = await fetchEnvironmentDeleteCounts(42, async (url) => {
+			if (url.startsWith('/api/stacks')) {
+				throw new Error('connection timed out');
+			}
+			return new Response(JSON.stringify([]));
+		});
+
+		assert.deepEqual(result, {
+			stackCount: 0,
+			gitStackCount: 0,
+			unknown: true
+		});
+	});
+
+	it('fails closed when an endpoint returns an invalid payload', async () => {
+		const result = await fetchEnvironmentDeleteCounts(42, async (url) => {
+			return url.includes('/api/git/')
+				? new Response('{invalid json')
+				: new Response(JSON.stringify([]));
+		});
+
+		assert.equal(result.unknown, true);
+		assert.equal(result.gitStackCount, 0);
+	});
+});