Addresses second review pass on PR #3102:
- Remove cost.reasoning (reasoning tokens bill as normal output tokens,
no separate free/paid line item, matching repo convention)
- Add [interleaved] field = "reasoning_content" to all four models,
since EBCloud's endpoint returns reasoning via that field
- Document the reasoning-control investigation in provider.toml
(no verified effort/budget/toggle param found)
- Strip trailing whitespace, add trailing newline to provider.toml
- Normalize logo.svg viewBox to a 0 0 N N origin
Address review feedback on PR #3102: inherit provider-agnostic model
facts via base_model instead of duplicating them (fixes fabricated
dates, wrong temperature/limit overrides, and the DeepSeek-V4-Pro
copy-pasted description), switch logo fills to currentColor, and
correct GLM-5.1/Kimi-K2.6 pricing which had wrongly copied
DeepSeek-V4-Flash's rate.