Serve static files at root and redirect /explorer to /

[kmcginnes]

Parent PRD

• Parent Simplify client-server relationship by removing proxy URL from connection config #1618

What to build

Change the Express server to serve the React client static files at / instead of /explorer. Add redirect middleware so that requests to /explorer (and /explorer/*) redirect to / (and /*). Update GRAPH_EXP_ENV_ROOT_FOLDER default from /explorer to /. Update the Dockerfile and SageMaker variant accordingly.

Type: HITL — requires review before completion.

Acceptance criteria

• Static files are served at / instead of /explorer
• Requests to /explorer redirect (301) to /
• Requests to /explorer/some/path redirect to /some/path
• GRAPH_EXP_ENV_ROOT_FOLDER defaults to / in the Dockerfile
• SageMaker variant uses /proxy/9250/ instead of /proxy/9250/explorer
• Vite config base default changes from /explorer to /
• Tests verify the redirect behavior

Blocked by

• Blocked by Move Express API routes under /api/ prefix #1619

User stories addressed

• User story 7
• User story 14