feat(agentic-workflow): add llm_provider_id to the workflow model schemas

[fabienfleureau]

• llm_provider_id (nullable uuid) on AgenticWorkflowModelRequest and AgenticWorkflowModelResponse
• absent by default, so inline api_key configuration is unchanged
• returned in the response, unlike api_key, because it names a credential rather than carrying one

Why: an agentic workflow can now take its credential from an existing LLM provider instead of retyping and rotating the key per workflow.

Verified: YAML parses and both schemas expose the field; spectral:oas finding count is identical to the baseline (261). The repo's own ruleset URL in .spectral.mjs 404s, on this branch and on unmodified main alike, so npm test could not run locally.

Backend: qovery/backend/q-core!3955

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Summary by cubic

Adds llm_provider_id to the AgenticWorkflowModelRequest and AgenticWorkflowModelResponse schemas, letting workflows reuse an existing LLM provider credential instead of an inline api_key.

• Nullable and absent by default, so inline api_key configuration remains unchanged.
• Returned in the response, unlike api_key, because it references a credential rather than carrying it.
• Requests with both llm_provider_id and api_key are rejected; the provider must belong to the workflow's organization and be usable by the caller.

^{Written for commit da4256a. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}

[Copilot]

🟡 Changes recommended

The response schema has an unresolved moderate contract issue, alongside a minor grammar nit.

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Pull request overview

Adds nullable llm_provider_id support to agentic workflow request and response schemas, enabling reuse of existing LLM provider credentials.

Changes:

• Adds the provider UUID to both schemas.
• Documents provider validation and exclusivity with api_key.
• Preserves inline api_key behavior when no provider is specified.

File summaries

File	Summary	Review findings
openapi.yaml	Updates agentic workflow model request and response schemas.	Nit (1 vote): fix incomplete grammar at line 32155. Moderate (2 votes): require nullable llm_provider_id in responses to distinguish null from omission.

Review details

Suppressed comments (1)

openapi.yaml:32155

• The phrase "be one the caller may use" is grammatically incomplete. Please change it to "be one that the caller may use" so the provider eligibility requirement is clear.

            workflow's organization, be one the caller may use, and match `type`.

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite

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