chore: clean up repo for public release

- Remove BMAD framework, IDE configs, dev screenshots, test files,
  internal docs, and backup files
- Rename keep-notes/ to memento-note/
- Update all references from keep-notes to memento-note
- Add Apache 2.0 license with Commons Clause (non-commercial restriction)
- Add clean .gitignore and .env.docker.example

mcp-server/start.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
 export PORT=4242
-export DATABASE_URL="file:../keep-notes/prisma/dev.db"
+export DATABASE_URL="file:../memento-note/prisma/dev.db"
 export MCP_LOG_LEVEL=info
 node index-sse.js