feat: portfolio redesign with i18n, RBC project showcase, CI/CD

- Add i18n support (EN/ZH) with language toggle
- Redesign header with education dropdown, contact copy buttons
- Add RBC project showcase with bullet points, skills highlighting
- Create terraform-drift placeholder page
- Add ProjectShowcase component with media toggle (image/video)
- Update experience timeline with action-driven descriptions
- Add Docker + Forgejo CI workflow for image builds
- Update K8s manifests for riotpiao.com ingress
- Add DESIGN.md documenting design system patterns

lib/TerminalContext.tsx

@@ -0,0 +1,28 @@
+'use client'
+
+import { createContext, useContext, useState, ReactNode } from 'react'
+
+interface TerminalContextType {
+  isOpen: boolean
+  setIsOpen: (open: boolean) => void
+}
+
+const TerminalContext = createContext<TerminalContextType | undefined>(undefined)
+
+export function TerminalProvider({ children }: { children: ReactNode }) {
+  const [isOpen, setIsOpen] = useState(false)
+
+  return (
+    <TerminalContext.Provider value={{ isOpen, setIsOpen }}>
+      {children}
+    </TerminalContext.Provider>
+  )
+}
+
+export function useTerminal() {
+  const context = useContext(TerminalContext)
+  if (!context) {
+    throw new Error('useTerminal must be used within TerminalProvider')
+  }
+  return context
+}