Add GitHub integration for PRs, issues and AI PR description (#205)

* feat: integrate GitHub OAuth device flow across runtimes

Add GitHub OAuth device flow endpoints across runtimes
Introduce GitHubSettings UI panel and sidebar entry
Persist GitHub auth state in per-runtime storage

* feat: add GitHub PR status and PR description generation

Show PR status for the current branch in the Git view
Generate a pull request description from the diff between base and head
Expose prStatus, prCreate, and prMerge APIs in web and desktop clients

* feat: add GitHub PR ready for review

Add API to mark pull requests as ready for review
Show a Ready button for draft PRs and reflect status in UI
Handle token expiration and GraphQL errors when marking ready

packages/web/src/api/index.ts

@@ -7,6 +7,7 @@ import { createWebPermissionsAPI } from './permissions';
 import { createWebNotificationsAPI } from './notifications';
 import { createWebToolsAPI } from './tools';
 import { createWebPushAPI } from './push';
+import { createWebGitHubAPI } from './github';
 
 export const createWebAPIs = (): RuntimeAPIs => ({
   runtime: { platform: 'web', isDesktop: false, isVSCode: false, label: 'web' },
@@ -16,6 +17,7 @@ export const createWebAPIs = (): RuntimeAPIs => ({
   settings: createWebSettingsAPI(),
   permissions: createWebPermissionsAPI(),
   notifications: createWebNotificationsAPI(),
+  github: createWebGitHubAPI(),
   push: createWebPushAPI(),
   tools: createWebToolsAPI(),
 });