fix: align MCP server schema with memento-note + per-request user isolation

- Remove `embedding` column from MCP Note model (dropped by migration 20260425120000)
- Add missing columns: trashedAt, dismissedFromRecent, contentUpdatedAt, cardSizeMode
- Add NoteEmbedding model and Label.notebook relation
- Use AsyncLocalStorage to pass authenticated userId from API key to tool handlers
- Enable SSE mode and auth in docker-compose for N8N integration

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docker-compose.yml

@@ -80,6 +80,8 @@ services:
       - DATABASE_URL=postgresql://${POSTGRES_USER:-memento}:${POSTGRES_PASSWORD:-memento}@postgres:5432/${POSTGRES_DB:-memento}
       - NODE_ENV=production
       - APP_BASE_URL=http://memento-note:3000
+      - MCP_MODE=sse
+      - MCP_REQUIRE_AUTH=true
     depends_on:
       postgres:
         condition: service_healthy