feat(providers): add Prism BYOK support

[rajitkhanna]

Summary

• add Prism as a first-class BYOK-only inference provider
• expose DeepSeek-V4.1-Flash and DeepSeek-V4-Flash through Prism
• support streaming reasoning, tool loops, structured outputs, and usage accounting
• add Prism to provider settings, usage UI, model metadata, and docs

Provider details

• OpenAI-compatible base URL: https://api.prisminference.com/v1
• canonical model IDs are forwarded unchanged
• workspace BYOK keys take precedence over inline keys
• Prism never falls back to a Sim-hosted or environment API key

Test plan

• bun run --cwd apps/sim test providers/prism/index.test.ts providers/models.test.ts lib/api-key/byok.test.ts providers/attachments.test.ts ee/organization-usage/components/usage-consumers.test.ts
• bunx turbo run type-check
• bun run format:check
• bun run check:byok-providers
• bun run check:icon-paths
• bun run check:icon-path-precision
• bun run check:bare-icons
• bun run docs:check
• bun run agent-stream-docs:check
• bun run check:api-validation

[vercel]

@rajitkhanna is attempting to deploy a commit to the Sim Team on Vercel.

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[greptile-apps]

Confidence Score: 4/5

The PR is not yet safe to merge because streamed Prism tool executions discard their final tool-result payloads, and the single-consumer utility also violates an explicit repository requirement.

Findings

1.  Streaming drops tool results ▶
2.  Single-consumer utility violates architecture ▶

Summary

• Registers Prism models and provider metadata without adding them to the hosted model pool.
• Resolves workspace Prism keys ahead of inline keys and provides no environment or platform fallback.
• Reuses the shared OpenAI-compatible streaming and tool-loop infrastructure.
• Adds provider UI, usage attribution, attachment restrictions, documentation, and focused tests.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Prism model request] --> B{Workspace BYOK key exists?}
  B -->|Yes| C[Use workspace key]
  B -->|No| D{Inline key exists?}
  D -->|Yes| E[Use inline key]
  D -->|No| F[Reject request]
  C --> G[Prism OpenAI-compatible API]
  E --> G
  G --> H{Tools requested?}
  H -->|No| I[Completion or reasoning stream]
  H -->|Yes| J[Shared streaming tool loop]
  J --> K[Execute tools and replay reasoning]
  K --> L[Finalize normalized output]

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