sync fix of agent calling from branch

Add session architecture section to README

Update SDK and WeChat miniprogram to match test-chat.html features

Call setStatus on page load, use gray icon for Ready state

Change Ready status to rainbow icon for no session state

Change Ready status icon to light blue

Replace status text with colored icons and tooltips

Add blinking dots, textarea with auto-resize, Ctrl+Enter to send

Add markdown rendering support with marked.js

UI refresh: remove avatars, light daytime theme

Fix CORS, agent spawn, and UI improvements

Add .gitignore and pnpm-workspace.yaml

Update port to 3008 and add tsx dependency

Change port to 3008

Update README with concurrent processing docs