Serve campaign vanity links directly from the backend (#964)

[JoaquinBN]

• Serve campaign vanity links directly from the backend

The backend now answers the public /join// contract itself, in addition to the internal /campaigns/redirect path. Production hosting is CloudFront + S3 rather than Amplify, so the CDN only needs a plain /join/* pass-through behavior pointing at the backend origin, with no edge URL rewriting. The Amplify rule (used only by Amplify-hosted environments) now targets the live backend domain instead of the retired Lightsail host.

Claude Implementation Notes

• backend/tally/urls.py: top-level re_path serving /join// via campaigns.views.campaign_redirect (name campaign_join); /campaigns/redirect/... unchanged
• backend/campaigns/tests/test_resolver.py: /join path resolves with correct utm_id and 404s unknown aliases
• amplify.yml: /join/<> target updated to https://portal-admin.genlayer.foundation/join/<> (old Lightsail host is dead); comment documents the CloudFront equivalent for production
• backend/CLAUDE.md: resolver docs reflect the direct /join route and the CloudFront + S3 production setup

• Complete the public join-route contract in docs and tests

The public /join redirect test now asserts the full contract (302 with Cache-Control no-store for both GET and HEAD, optional trailing slash, unknown alias 404), and the backend docs describe the exact CloudFront pass-through configuration and list the /join endpoint instead of the obsolete Amplify-proxy claim.

Claude Implementation Notes

• backend/campaigns/tests/test_resolver.py: join-path test asserts no-store on GET and HEAD, trailing slash, and 404
• backend/CLAUDE.md: endpoint summary lists GET /join/{role}/{alias} with the CDN pass-through note; campaigns section names the CloudFront methods (GET/HEAD), CachingDisabled cache policy, and AllViewerExceptHostHeader origin request policy

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