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/app/(main)/admin/settings/page.tsx

@@ -0,0 +1,23 @@
+import { getSystemConfig } from '@/app/actions/admin-settings'
+import { AdminSettingsForm } from './admin-settings-form'
+
+export default async function AdminSettingsPage() {
+  const config = await getSystemConfig()
+
+  return (
+    <div className="space-y-6">
+      <div>
+        <h1 className="text-3xl font-bold text-gray-900 dark:text-white">
+          Settings
+        </h1>
+        <p className="text-gray-600 dark:text-gray-400 mt-1">
+          Configure application-wide settings
+        </p>
+      </div>
+
+      <div className="bg-white dark:bg-zinc-900 rounded-lg shadow overflow-hidden border border-gray-200 dark:border-gray-800 p-6">
+        <AdminSettingsForm config={config} />
+      </div>
+    </div>
+  )
+}