refactor(HAI-116): rename kb to hai across all packages, CLI, and docs

- Rename npm packages from @kb/* to @hai/* and update all workspace references
- Rename CLI binary from kb to hai and config directory from .kb to .hai
- Update dashboard UI branding, titles, and references from kb to hai
- Update all test files, CI workflows, and documentation to reflect new naming
- Run comprehensive grep verification to ensure no stale kb references remain

packages/dashboard/app/components/Header.tsx

@@ -8,8 +8,8 @@ export function Header({ onOpenSettings }: HeaderProps) {
   return (
     <header className="header">
       <div className="header-left">
-        <img src="/logo.svg" alt="hai logo" className="header-logo" width={24} height={24} />
-        <h1 className="logo">hai</h1>
+        <img src="/logo.svg" alt="kb logo" className="header-logo" width={24} height={24} />
+        <h1 className="logo">kb</h1>
         <span className="logo-sub">board</span>
       </div>
       <div className="header-actions">