feat: implement landing page and documentation site with CLI integration and status command

docs: update install command to one-liner

docs: rebrand brain commands to ever-brain in frontend

feat: implement Ever Brain API backend and documentation portal

feat: initialize documentation page and project structure for Brain Base

Deployment: Softened UI background, updated AGENT.md root logic, and finalized docs

Docs: Updated iwr command to be dynamic and added Toast system

UI: Added dedicated /docs page and polished command reference