Add a public GET /api/ui/agent-starters endpoint returning localized
empty-state content (title, description, preview images, and starter
prompts) for the canvas Agent panel. Content is server-configurable via
AgentStarter config with built-in zh-CN/en-US fallbacks, and the route is
exempt from authentication so shared canvases render the same content.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Authenticate requests solely from the Authorization: Bearer header on the
server; stop accepting the legacy `token` header and `usertoken` cookie.
The frontend no longer sets auth cookies (only clears legacy ones), omits
credentials on all requests, and drops the redundant `token` header. Project
event SSE now streams over fetch so it can carry the Authorization header,
which EventSource cannot.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
root