- ChannelsView platformOrder now includes the three CN provider
platforms so channel pricing can be configured for them; composite
group expansion/attachment stays limited to the five main platforms
(matches backend isConcreteRequestPlatform and composite-routes
target_platform validation)
- SyncPricingModels maps kimi->moonshot, zhipu->zhipu,
deepseek->deepseek; also fixes gemini mapping to "google" which
matched zero catalog entries (provider key is "gemini")
- Add CN platform colors to channel pricing model tag classes