URGENT: Fix frontend localhost bug - merge to hosting-railway

[railway-app]

Problem

The frontend was showing BACKBONE OFFLINE in production because getApiBaseUrl() in api.ts and resolveBaseUrl() in intelligence/client.ts both constructed the API URL using window.location.hostname:8000. In production, this resolves to the frontend's Railway hostname on port 8000, which is not publicly routable — causing every API call to fail.

Solution

Added a PRODUCTION_API_URL constant pointing to https://thesphere-production-4aea.up.railway.app in both files. Both URL resolver functions now check if the hostname is not localhost or 127.0.0.1 and, when in production, return the hardcoded public backend URL instead of constructing a broken hostname:port URL. The NEXT_PUBLIC_API_BASE_URL env var override is still respected as the highest-priority option.

Changes

• Modified frontend/src/lib/api.ts
• Modified frontend/src/lib/intelligence/client.ts

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