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/.dockerignore

@@ -0,0 +1,53 @@
+# Dependencies
+node_modules
+npm-debug.log
+yarn-error.log
+
+# Next.js
+.next
+out
+build
+dist
+
+# Production
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# Development files
+.git
+.gitignore
+README.md
+.eslintrc.json
+.prettierrc*
+
+# IDE
+.vscode
+.idea
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Testing
+coverage
+.nyc_output
+playwright-report
+test-results
+
+# Misc
+.turbo
+*.log
+
+# BMAD output (not needed in container)
+_bmad-output
+
+# Docker files
+Dockerfile
+.dockerignore
+docker-compose.yml
+deploy.sh