chore: clean up repo for public release

- Remove BMAD framework, IDE configs, dev screenshots, test files,
  internal docs, and backup files
- Rename keep-notes/ to memento-note/
- Update all references from keep-notes to memento-note
- Add Apache 2.0 license with Commons Clause (non-commercial restriction)
- Add clean .gitignore and .env.docker.example

memento-note/context/NoteRefreshContext.tsx

@@ -0,0 +1,32 @@
+'use client'
+
+import { createContext, useContext, useState, useCallback } from 'react'
+
+interface NoteRefreshContextType {
+  refreshKey: number
+  triggerRefresh: () => void
+}
+
+const NoteRefreshContext = createContext<NoteRefreshContextType | undefined>(undefined)
+
+export function NoteRefreshProvider({ children }: { children: React.ReactNode }) {
+  const [refreshKey, setRefreshKey] = useState(0)
+
+  const triggerRefresh = useCallback(() => {
+    setRefreshKey(prev => prev + 1)
+  }, [])
+
+  return (
+    <NoteRefreshContext.Provider value={{ refreshKey, triggerRefresh }}>
+      {children}
+    </NoteRefreshContext.Provider>
+  )
+}
+
+export function useNoteRefresh() {
+  const context = useContext(NoteRefreshContext)
+  if (!context) {
+    throw new Error('useNoteRefresh must be used within NoteRefreshProvider')
+  }
+  return context
+}