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/register-form.tsx

@@ -0,0 +1,107 @@
+'use client';
+
+import { useActionState } from 'react';
+import { useFormStatus } from 'react-dom';
+import { register } from '@/app/actions/register';
+import { Button } from '@/components/ui/button';
+import { Input } from '@/components/ui/input';
+import Link from 'next/link';
+import { useLanguage } from '@/lib/i18n';
+
+function RegisterButton() {
+  const { pending } = useFormStatus();
+  const { t } = useLanguage();
+  return (
+    <Button className="w-full mt-4" aria-disabled={pending}>
+      {t('auth.signUp')}
+    </Button>
+  );
+}
+
+export function RegisterForm() {
+  const [errorMessage, dispatch] = useActionState(register, undefined);
+  const { t } = useLanguage();
+
+  return (
+    <form action={dispatch} className="space-y-3">
+      <div className="flex-1 rounded-lg bg-gray-50 px-6 pb-4 pt-8">
+        <h1 className="mb-3 text-2xl font-bold">
+          {t('auth.createAccount')}
+        </h1>
+        <div className="w-full">
+          <div>
+            <label
+              className="mb-3 mt-5 block text-xs font-medium text-gray-900"
+              htmlFor="name"
+            >
+              {t('auth.name')}
+            </label>
+            <div className="relative">
+              <Input
+                className="peer block w-full rounded-md border border-gray-200 py-[9px] pl-10 text-sm outline-2 placeholder:text-gray-500"
+                id="name"
+                type="text"
+                name="name"
+                placeholder={t('auth.namePlaceholder')}
+                required
+              />
+            </div>
+          </div>
+          <div className="mt-4">
+            <label
+              className="mb-3 mt-5 block text-xs font-medium text-gray-900"
+              htmlFor="email"
+            >
+              {t('auth.email')}
+            </label>
+            <div className="relative">
+              <Input
+                className="peer block w-full rounded-md border border-gray-200 py-[9px] pl-10 text-sm outline-2 placeholder:text-gray-500"
+                id="email"
+                type="email"
+                name="email"
+                placeholder={t('auth.emailPlaceholder')}
+                required
+              />
+            </div>
+          </div>
+          <div className="mt-4">
+            <label
+              className="mb-3 mt-5 block text-xs font-medium text-gray-900"
+              htmlFor="password"
+            >
+              {t('auth.password')}
+            </label>
+            <div className="relative">
+              <Input
+                className="peer block w-full rounded-md border border-gray-200 py-[9px] pl-10 text-sm outline-2 placeholder:text-gray-500"
+                id="password"
+                type="password"
+                name="password"
+                placeholder={t('auth.passwordMinChars')}
+                required
+                minLength={6}
+              />
+            </div>
+          </div>
+        </div>
+        <RegisterButton />
+        <div
+          className="flex h-8 items-end space-x-1"
+          aria-live="polite"
+          aria-atomic="true"
+        >
+          {errorMessage && (
+            <p className="text-sm text-red-500">{errorMessage}</p>
+          )}
+        </div>
+        <div className="mt-4 text-center text-sm">
+          {t('auth.hasAccount')}{' '}
+          <Link href="/login" className="underline">
+            {t('auth.signIn')}
+          </Link>
+        </div>
+      </div>
+    </form>
+  );
+}