Public API CreateSessionRequest missing displayName field

[jeremyeder]

Jira: RHOAIENG-51909

Bug

The public API's CreateSessionRequest DTO (components/public-api/types/dto.go) only accepts three fields:

type CreateSessionRequest struct {
    Task  string `json:"task" binding:"required"`
    Model string `json:"model,omitempty"`
    Repos []Repo `json:"repos,omitempty"`
}

There is no displayName field, so session display names sent by the MCP server (or any API client) are silently dropped. The backend supports display names, but the public API gateway strips them during request transformation.

Expected behavior

The public API should accept a displayName field and forward it to the backend, so sessions can have human-readable names.

Suggested fix

Add DisplayName to CreateSessionRequest in components/public-api/types/dto.go and include it in the backend request transformation in components/public-api/handlers/sessions.go.

/cc @markturansky

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