feat(ai): server prompt templates

[dlarocque]

Adds support for Server Prompt Templates. This feature allows developers to define and manage prompt on the server-side, which can then be executed from the client by referencing a template ID and providing variables.

API Changes: go/firebase-ai-server-prompt-template

Internal changes:

• Request Parameter Object: The makeRequest function and RequestUrl constructor were refactored. Previously, they accepted a long list of individual arguments (model, task, apiSettings ,...), and were only able to make requests for model generation. This has been changed to a single configuration object which is either a ModelRequestURLParams or a TemplateRequestURLParams.
  • Easier to add configuration options without having to change the function signature
  • Allows us to make requests to URLs that aren't only for model generation.
• Backend Pathing: The Backend abstract class and its implementations (VertexAIBackend, GoogleAIBackend) are now responsible for construction the request URL paths by implementing new methods _getTemplatePath and _getModelPath. This removes the need to have conditional logic in the request building logic if (backend is vertex ai) ... else ....

[changeset-bot]

🦋 Changeset detected

Latest commit: d4542c5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
firebase	Minor
@firebase/ai	Minor

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[github-actions]

Changeset File Check ✅

• No modified packages are missing from the changeset file.
• No changeset formatting errors detected.

[google-oss-bot]

Size Report ¹

Affected Products

• @firebase/ai

  Type	Base (c47bd71)	Merge (1415f13)	Diff
  browser	65.4 kB	67.4 kB	+2.03 kB (+3.1%)
  main	69.2 kB	71.7 kB	+2.49 kB (+3.6%)
  module	65.4 kB	67.4 kB	+2.03 kB (+3.1%)

• @firebase/remote-config

  Type	Base (c47bd71)	Merge (1415f13)	Diff
  browser	39.0 kB	41.5 kB	+2.47 kB (+6.3%)
  main	40.2 kB	42.7 kB	+2.47 kB (+6.1%)
  module	39.0 kB	41.5 kB	+2.47 kB (+6.3%)

• bundle

  Type	Base (c47bd71)	Merge (1415f13)	Diff
  remote-config (getAndFetch)	59.4 kB	61.0 kB	+1.58 kB (+2.7%)

• firebase

  Type	Base (c47bd71)	Merge (1415f13)	Diff
  firebase-ai.js	51.4 kB	52.8 kB	+1.44 kB (+2.8%)
  firebase-compat.js	809 kB	811 kB	+1.50 kB (+0.2%)
  firebase-remote-config-compat.js	38.7 kB	40.2 kB	+1.50 kB (+3.9%)
  firebase-remote-config.js	43.5 kB	45.1 kB	+1.55 kB (+3.6%)

Test Logs

• Base (c47bd71): https://github.com/firebase/firebase-js-sdk/actions/runs/18952614188
• Merge (1415f13): https://github.com/firebase/firebase-js-sdk/actions/runs/19301050252

1. https://storage.googleapis.com/firebase-sdk-metric-reports/dFVBKRnp7q.html

[google-oss-bot]

Size Analysis Report ¹

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Test Logs

• Base (c47bd71): https://github.com/firebase/firebase-js-sdk/actions/runs/18952614188
• Merge (1415f13): https://github.com/firebase/firebase-js-sdk/actions/runs/19301050252

1. https://storage.googleapis.com/firebase-sdk-metric-reports/zPOr68Oe0C.html