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/scripts/compare-dbs.ts

@@ -0,0 +1,41 @@
+
+import { siteConfig } from '../config/site'
+import { PrismaClient } from '@prisma/client'
+
+async function main() {
+    console.log('🕵️‍♀️ Comparing Databases...')
+
+    // 1. Check Root DB
+    console.log('--- ROOT DB (./dev.db) ---')
+    const prismaRoot = new PrismaClient({
+        datasources: { db: { url: 'file:./dev.db' } }
+    })
+    try {
+        const countRoot = await prismaRoot.note.count()
+        console.log(`📦 Note Count: ${countRoot}`)
+        const usersRoot = await prismaRoot.user.count()
+        console.log(`👥 User Count: ${usersRoot}`)
+    } catch (e) {
+        console.log('❌ Failed to connect to Root DB', e)
+    } finally {
+        await prismaRoot.$disconnect()
+    }
+
+    // 2. Check Prisma Folder DB
+    console.log('\n--- PRISMA DB (./prisma/dev.db) ---')
+    const prismaPrisma = new PrismaClient({
+        datasources: { db: { url: 'file:./prisma/dev.db' } }
+    })
+    try {
+        const countPrisma = await prismaPrisma.note.count()
+        console.log(`📦 Note Count: ${countPrisma}`)
+        const usersPrisma = await prismaPrisma.user.count()
+        console.log(`👥 User Count: ${usersPrisma}`)
+    } catch (e) {
+        console.log('❌ Failed to connect to Prisma DB', e)
+    } finally {
+        await prismaPrisma.$disconnect()
+    }
+}
+
+main().catch(console.error)