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/transform-markdown/route.ts

@@ -0,0 +1,90 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { auth } from '@/auth'
+import { getAIProvider } from '@/lib/ai/factory'
+import { getSystemConfig } from '@/lib/config'
+
+export async function POST(request: NextRequest) {
+  try {
+    const session = await auth()
+
+    if (!session?.user?.id) {
+      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+    }
+
+    const { text } = await request.json()
+
+    // Validation
+    if (!text || typeof text !== 'string') {
+      return NextResponse.json({ error: 'Text is required' }, { status: 400 })
+    }
+
+    // Validate word count
+    const wordCount = text.split(/\s+/).length
+    if (wordCount < 10) {
+      return NextResponse.json(
+        { error: 'Text must have at least 10 words to transform' },
+        { status: 400 }
+      )
+    }
+
+    if (wordCount > 500) {
+      return NextResponse.json(
+        { error: 'Text must have maximum 500 words to transform' },
+        { status: 400 }
+      )
+    }
+
+    const config = await getSystemConfig()
+    const provider = getAIProvider(config)
+
+    // Detect language from text
+    const hasFrench = /[àâäéèêëïîôùûüÿç]/i.test(text)
+    const responseLanguage = hasFrench ? 'French' : 'English'
+
+    // Build prompt to transform text to Markdown
+    const prompt = hasFrench
+      ? `Tu es un expert en Markdown. Transforme ce texte ${responseLanguage} en Markdown bien formaté.
+
+IMPORTANT :
+- Ajoute des titres avec ## pour les sections principales
+- Utilise des listes à puces (-) ou numérotées (1.) quand approprié
+- Ajoute de l'emphase (gras **texte**, italique *texte*) pour les mots clés
+- Utilise des blocs de code pour le code ou les commandes
+- Présente l'information de manière claire et structurée
+- GARDE le même sens et le contenu, seul le format change
+
+Texte à transformer :
+${text}
+
+Réponds SEULEMENT avec le texte transformé en Markdown, sans explications.`
+      : `You are a Markdown expert. Transform this ${responseLanguage} text into well-formatted Markdown.
+
+IMPORTANT:
+- Add headings with ## for main sections
+- Use bullet lists (-) or numbered lists (1.) when appropriate
+- Add emphasis (bold **text**, italic *text*) for key terms
+- Use code blocks for code or commands
+- Present information clearly and structured
+- KEEP the same meaning and content, only change the format
+
+Text to transform:
+${text}
+
+Respond ONLY with the transformed Markdown text, no explanations.`
+
+    
+    const transformedText = await provider.generateText(prompt)
+
+    
+    return NextResponse.json({
+      originalText: text,
+      transformedText: transformedText,
+      language: responseLanguage
+    })
+  } catch (error: any) {
+    return NextResponse.json(
+      { error: error.message || 'Failed to transform text to Markdown' },
+      { status: 500 }
+    )
+  }
+}