feat: add persistent desktop assistant workspace

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

src/main/agent/anthropic-endpoint.ts

@@ -0,0 +1,12 @@
+export function createAnthropicApiBaseUrl(baseUrl: string): string {
+  const url = new URL(baseUrl)
+  const path = url.pathname.replace(/\/+$/, '')
+  url.pathname = path.endsWith('/v1') ? path : `${path}/v1`
+  url.search = ''
+  url.hash = ''
+  return url.toString().replace(/\/$/, '')
+}
+
+export function createAnthropicMessagesUrl(baseUrl: string): URL {
+  return new URL(`${createAnthropicApiBaseUrl(baseUrl)}/messages`)
+}