feat: rebrand to RootNode Academy + add Real Ops scenario bundle

- Rename app title, header, tagline, footer, terminal tab to RootNode Academy
- Apply RootNode color palette (#39FF14 green, #00D4FF blue, GitHub-style darks)
- Add rootnode-runaway-monitor scenario (homelab NOC incident: oversized memory request)
- Add rootnode-real-ops bundle in terminal-green accent
- Update package name to rootnode-academy-ui

frontend/src/components/Terminal.jsx

@@ -147,7 +147,7 @@ export default function TerminalComponent({ collapsed, onToggleCollapse }) {
           </div>
           <span className={styles.barTitle}>
             <span className={styles.barIcon}>$_</span>
-            bash — kubekosh
+            bash — rootnode
           </span>
         </div>
         <div className={styles.barRight}>