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/ai/reformulate/route.ts

@@ -0,0 +1,57 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { auth } from '@/auth'
+import { paragraphRefactorService } from '@/lib/ai/services/paragraph-refactor.service'
+
+export async function POST(request: NextRequest) {
+  try {
+    const session = await auth()
+
+    if (!session?.user?.id) {
+      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+    }
+
+    const { text, option } = await request.json()
+
+    // Validation
+    if (!text || typeof text !== 'string') {
+      return NextResponse.json({ error: 'Text is required' }, { status: 400 })
+    }
+
+    // Map option to refactor mode
+    const modeMap: Record<string, 'clarify' | 'shorten' | 'improveStyle'> = {
+      'clarify': 'clarify',
+      'shorten': 'shorten',
+      'improve': 'improveStyle'
+    }
+
+    const mode = modeMap[option]
+    if (!mode) {
+      return NextResponse.json(
+        { error: 'Invalid option. Use: clarify, shorten, or improve' },
+        { status: 400 }
+      )
+    }
+
+    // Validate word count
+    const validation = paragraphRefactorService.validateWordCount(text)
+    if (!validation.valid) {
+      return NextResponse.json({ error: validation.error }, { status: 400 })
+    }
+
+    // Use the ParagraphRefactorService
+    const result = await paragraphRefactorService.refactor(text, mode)
+
+    return NextResponse.json({
+      originalText: result.original,
+      reformulatedText: result.refactored,
+      option: option,
+      language: result.language,
+      wordCountChange: result.wordCountChange
+    })
+  } catch (error: any) {
+    return NextResponse.json(
+      { error: error.message || 'Failed to reformulate text' },
+      { status: 500 }
+    )
+  }
+}