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/setup-openai.ts

@@ -0,0 +1,48 @@
+import prisma from '../lib/prisma'
+
+/**
+ * Setup OpenAI as default AI provider in database
+ * Run this to ensure OpenAI is properly configured
+ */
+async function setupOpenAI() {
+  console.log('🔧 Setting up OpenAI as default AI provider...\n')
+
+  const configs = [
+    { key: 'AI_PROVIDER_TAGS', value: 'openai' },
+    { key: 'AI_PROVIDER_EMBEDDING', value: 'openai' },
+    { key: 'AI_MODEL_TAGS', value: 'gpt-4o-mini' },
+    { key: 'AI_MODEL_EMBEDDING', value: 'text-embedding-3-small' },
+  ]
+
+  try {
+    for (const config of configs) {
+      await prisma.systemConfig.upsert({
+        where: { key: config.key },
+        update: { value: config.value },
+        create: { key: config.key, value: config.value }
+      })
+      console.log(`✅ Set ${config.key} = ${config.value}`)
+    }
+
+    console.log('\n✨ OpenAI configuration complete!')
+    console.log('\nNext steps:')
+    console.log('1. Add your OPENAI_API_KEY in admin settings: http://localhost:3000/admin/settings')
+    console.log('2. Or add it to .env.docker: OPENAI_API_KEY=sk-...')
+    console.log('3. Restart the application')
+
+    // Verify
+    const verify = await prisma.systemConfig.findMany({
+      where: { key: { in: configs.map(c => c.key) } }
+    })
+
+    console.log('\n✅ Verification:')
+    verify.forEach(c => console.log(`   ${c.key}: ${c.value}`))
+  } catch (error) {
+    console.error('❌ Error:', error)
+    process.exit(1)
+  }
+}
+
+setupOpenAI()
+  .then(() => process.exit(0))
+  .catch(() => process.exit(1))