presets: add zephyr

[pi0]

This PR adds a built-in preset for Zephyr Cloud

(co-authored with @Nsttt based on ZephyrCloudIO/zephyr-packages#358)

Checklist:

• Working hello world
• Fix static asseets
• Support zephyr.provider config
  • Config schema
  • Pull on first build
• Lazy import zephyr-agent SDK with prompt to install

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Project	Deployment	Actions	Updated (UTC)
nitro.build	Ready	Preview, Comment	Feb 19, 2026 6:07pm

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