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/components/settings/SettingsSection.tsx

@@ -0,0 +1,36 @@
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
+
+interface SettingsSectionProps {
+  title: string
+  description?: string
+  icon?: React.ReactNode
+  children: React.ReactNode
+  className?: string
+}
+
+export function SettingsSection({
+  title,
+  description,
+  icon,
+  children,
+  className
+}: SettingsSectionProps) {
+  return (
+    <Card className={className}>
+      <CardHeader>
+        <CardTitle className="flex items-center gap-2">
+          {icon}
+          {title}
+        </CardTitle>
+        {description && (
+          <p className="text-sm text-gray-500 dark:text-gray-400 mt-1">
+            {description}
+          </p>
+        )}
+      </CardHeader>
+      <CardContent className="space-y-4">
+        {children}
+      </CardContent>
+    </Card>
+  )
+}