fix: add gpt-5.4 model series to Azure ChatOpenAI model list

[akshaykumaran705]

Summary

• Adds gpt-5.4, gpt-5.4-pro, gpt-5.4-mini, and gpt-5.4-nano to the azureChatOpenAI entry in packages/components/models.json
• Pricing mirrors the values already used for the same models in the regular chatOpenAI entry

Problem

PR #6028 added gpt-5.4-mini/gpt-5.4-nano (and the rest of the gpt-5.4 series) to the regular chatOpenAI model list, but models.json keeps a separate model array for azureChatOpenAI, which was never updated. As a result, Azure OpenAI users have no way to select these models in the node dropdown, and given Azure's upcoming retirement of older models, this blocks users who need to migrate (see #6411).

Change

Minimal, additive change — 4 new entries inserted into the existing azureChatOpenAI models array, in the same position/order used by the chatOpenAI list:

{ "label": "gpt-5.4-mini", "name": "gpt-5.4-mini", "input_cost": 0.00000075, "output_cost": 0.0000045 }

No other files needed changes — isReasoningModelOpenAI() in packages/components/src/utils.ts already classifies gpt-5.4-* correctly via its generic gpt-5 substring rule, so no logic changes were required, only the missing model-list entries.

Test plan

• packages/components/models.json validated as well-formed JSON
• Diffed against the original file to confirm only the 4 intended entries were added, no reformatting/reordering elsewhere

Fixes #6411

[gemini-code-assist]

Caution

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