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

memento-note/.mcp.json

@@ -0,0 +1,8 @@
+{
+  "mcpServers": {
+    "memento": {
+      "type": "http",
+      "url": "http://localhost:4242/mcp"
+    }
+  }
+}