feat: rename keep-notes to memento-note, migrate to PostgreSQL, fix MCP bugs

- Rename directory keep-notes -> memento-note with all code references
- Prisma: SQLite -> PostgreSQL (both app and MCP server schemas)
- Sync MCP schema with main app (add missing fields, relations, indexes)
- Delete 17 SQLite migrations (clean slate for PostgreSQL)
- Remove SQLite dependencies (@libsql/client, better-sqlite3, etc.)
- Fix MCP server: hardcoded Windows DB paths -> DATABASE_URL env var
- Fix MCP server: .dockerignore excluded index-sse.js (SSE mode broken)
- MCP Dockerfile: node:20 -> node:22
- Docker Compose: add postgres service, remove SQLite volume
- Generate favicon.ico, icon-192.png, icon-512.png, apple-icon.png
- Update layout.tsx icons and manifest.json for PNG icons
- Update all .env files for PostgreSQL
- Rewrite README.md with updated sections
- Remove mcp-server/node_modules and prisma/client-generated from git tracking

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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)
+  }, [refreshKey])
+
+  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
+}