feat: expand secure assistant workflows

Harden runtime execution and add local knowledge, Smart Heartbeat, usage visibility, responsive product surfaces, and cross-platform packaging support.

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

src/main/agent/openai-endpoint.ts

@@ -0,0 +1,15 @@
+export function createOpenAIApiBaseUrl(baseUrl: string): string {
+  const url = new URL(baseUrl)
+  url.pathname = url.pathname.replace(/\/+$/u, '')
+  url.search = ''
+  url.hash = ''
+  return url.toString().replace(/\/$/u, '')
+}
+
+export function createOpenAIChatCompletionsUrl(baseUrl: string): URL {
+  return new URL(`${createOpenAIApiBaseUrl(baseUrl)}/chat/completions`)
+}
+
+export function createOpenAIImagesGenerationsUrl(baseUrl: string): URL {
+  return new URL(`${createOpenAIApiBaseUrl(baseUrl)}/images/generations`)
+}