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/node_modules/.prisma/client/schema.prisma

@@ -5,7 +5,7 @@ generator client {
 
 datasource db {
   provider = "sqlite"
-  url      = "file:../../keep-notes/prisma/dev.db"
+  url      = "file:../../memento-note/prisma/dev.db"
 }
 
 model Note {