Add Veo 3.1 video model support

[AvantBras]

Summary

Adds Vertex AI Veo 3.1 video model support for:

• veo-3.1-fast-generate-preview
• veo-3.1-generate-preview

Updates the router allowlist/pricing model definitions and the Next video
template model picker/default/validation/types.

/claim #595

Verification

• pnpm -C packages/sdk/ts run type-check
• pnpm exec tsc --noEmit from templates/next-video-template
• pnpm exec prettier --check packages/app/server/src/providers/VertexAIProvider.ts packages/sdk/ts/src/supported-models/video/vertex-ai.ts templates/next-video-template/src/app/api/generate-video/validation.ts templates/next-video-template/src/app/api/generate-video/vertex.ts templates/next-video-template/src/components/video-generator.tsx templates/next-video-template/src/lib/types.ts

Note

pnpm -C packages/app/server run type-check reaches an existing unrelated
server type error after Prisma generation:

src/utils.ts(2,3): Module '"types"' declares 'ExactEvmPayloadAuthorization' locally, but it is not exported.

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[Copilot]

Pull request overview

Adds support for the new Vertex AI Veo 3.1 video model IDs across the Echo router + TS SDK pricing definitions, and updates the Next video template to expose/select/validate the new models.

Changes:

• Added veo-3.1-fast-generate-preview and veo-3.1-generate-preview to the Next video template model types, UI picker, default selection, and request validation.
• Added Veo 3.1 models (and pricing entries) to the TypeScript SDK’s supported Vertex AI video model list.
• Updated the server-side Vertex AI provider model list to include Veo 3.1 IDs.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
templates/next-video-template/src/lib/types.ts	Extends VideoModelOption with Veo 3.1 model IDs.
templates/next-video-template/src/components/video-generator.tsx	Adds Veo 3.1 options to the UI and makes 3.1 Fast the default selection.
templates/next-video-template/src/app/api/generate-video/vertex.ts	Expands accepted model union to include Veo 3.1.
templates/next-video-template/src/app/api/generate-video/validation.ts	Adds Veo 3.1 to the request allowlist validation.
packages/sdk/ts/src/supported-models/video/vertex-ai.ts	Adds Veo 3.1 to supported Vertex AI video models and pricing definitions.
packages/app/server/src/providers/VertexAIProvider.ts	Adds Veo 3.1 model IDs to the provider’s Veo model list.

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[AvantBras]

I don't feel like I am in a position to make a decision here since I don't know the future veo model naming patterns.