The launch provider setup screen rejected too many legitimate users:
a live credential probe ("key rejected"), a post-save runtime check
("still cannot reach X"), and an 8-char minimum all gated progression.
Corporate proxies, regional blocks, rate-limited/flaky probes, and
self-hosted endpoints all tripped these. Now we just require a
non-empty value and save it; a genuinely bad key surfaces later at
chat time instead of blocking onboarding.
7ea37cd082