v0.54.5 — DeepSeek V4.1 Flash; tables match the live 2026-10-20 catalogue

Added — DeepSeek V4.1 Flash

deepseek/deepseek-v4.1-flash ($0.14/$0.28, the same model and price as
deepseek-chat) has a price row and sits right after deepseek-chat in the
fast and cheap tiers. Base and Solana both serve it.

Fixed — the chat, free, image and video tables match the live catalogue (2026-10-20)

• 33 live paid chat ids that had no price row now reserve their own rate
  instead of the $5/$30 default (gpt-6.1-sol, gpt-5.6-*-pro, mistral-large-4,
  glm-5.3/-flash, qwen3.8-max/-flash, gemini-3.6/3.8-flash, hy4-preview,
  mimo-v2.5 and others). tencent/hy3 is dropped. gpt-6.1-sol's >272K
  long-context step is priced.
• The 17 hidden NVIDIA ids that the gateways serve at $0 now reserve $0, so an
  exhausted budget no longer refuses a free call.
• nvidia/deepseek-v4-pro and nvidia/deepseek-v4-flash leave the free set:
  the gateways retired both and answer 400. Bare deepseek-v4-pro reserves
  the paid deepseek/deepseek-v4-pro rate.
• The free tier was re-probed on both chains: nemotron-3-super-120b joins;
  north-mini-code and laguna-xs-2.1 leave it.
• Images: gpt-image-2.5-flare/-sunburst and grok-imagine-image-2.0 are
  added; grok-imagine-image-pro drops to $0.05. Video:
  grok-imagine-video-1.5 is added.