VinF Hybrid Inference: consolidate onDeviceParams initialization

[erikeldridge]

Problem statements:

1. we were initializing LanguageModelCreateOptions repeatedly, which made it hard to reason about and maintain
2. the VinF SDK allows some params, such as systemParam, to be set during construction and inference. We were partially implementing this pattern, which made the code confusing.

So, this change:

1. defines a single default value for onDeviceParams and initializes onDeviceParams.expectedInput in a single place
2. removes support for passing options via the request. We can add this as a standalone feature later if there's demand.

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Latest commit: 2e83dca

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[google-oss-bot]

Size Report ¹

Affected Products

• @firebase/vertexai

  Type	Base (a250559)	Merge (12fbbdd)	Diff
  browser	46.0 kB	46.0 kB	-3 B (-0.0%)
  main	47.1 kB	47.1 kB	-3 B (-0.0%)
  module	46.0 kB	46.0 kB	-3 B (-0.0%)

• firebase

  Type	Base (a250559)	Merge (12fbbdd)	Diff
  firebase-vertexai.js	36.1 kB	36.1 kB	+17 B (+0.0%)

Test Logs

• Base (a250559): https://github.com/firebase/firebase-js-sdk/actions/runs/14630884672
• Merge (12fbbdd): https://github.com/firebase/firebase-js-sdk/actions/runs/14648368216

1. https://storage.googleapis.com/firebase-sdk-metric-reports/EiJxQ6XuFt.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

• @firebase/vertexai

  • getGenerativeModel

    Size

    Type	Base (a250559)	Merge (12fbbdd)	Diff
    size	26.1 kB	26.2 kB	+50 B (+0.2%)
    size-with-ext-deps	45.1 kB	45.2 kB	+50 B (+0.1%)

Test Logs

• Base (a250559): https://github.com/firebase/firebase-js-sdk/actions/runs/14630884672
• Merge (12fbbdd): https://github.com/firebase/firebase-js-sdk/actions/runs/14648368216

1. https://storage.googleapis.com/firebase-sdk-metric-reports/6FGQjYaoEu.html