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/api/cron/reminders/route.ts

@@ -0,0 +1,62 @@
+import { NextResponse } from 'next/server';
+import prisma from '@/lib/prisma';
+
+export const dynamic = 'force-dynamic'; // No caching
+
+export async function POST(request: Request) {
+  try {
+    const now = new Date();
+
+    // 1. Find all due reminders that haven't been processed
+    const dueNotes = await prisma.note.findMany({
+      where: {
+        reminder: {
+          lte: now, // Less than or equal to now
+        },
+        isReminderDone: false,
+        isArchived: false, // Optional: exclude archived notes
+      },
+      select: {
+        id: true,
+        title: true,
+        content: true,
+        reminder: true,
+        // Add other fields useful for notification
+      },
+    });
+
+    if (dueNotes.length === 0) {
+      return NextResponse.json({ 
+        success: true, 
+        count: 0, 
+        message: 'No due reminders found' 
+      });
+    }
+
+    // 2. Mark them as done (Atomic operation logic would be better but simple batch update is fine here)
+    const noteIds = dueNotes.map((n: any) => n.id);
+    
+    await prisma.note.updateMany({
+      where: {
+        id: { in: noteIds }
+      },
+      data: {
+        isReminderDone: true
+      }
+    });
+
+    // 3. Return the notes to N8N so it can send emails/messages
+    return NextResponse.json({
+      success: true,
+      count: dueNotes.length,
+      reminders: dueNotes
+    });
+
+  } catch (error) {
+    console.error('Error processing cron reminders:', error);
+    return NextResponse.json(
+      { success: false, error: 'Internal Server Error' },
+      { status: 500 }
+    );
+  }
+}