Add iss element to jwt claim

[seun-ja]

Adds optional issuer to claims

[Copilot]

Pull request overview

Adds an optional JWT issuer (iss) claim to the crate’s JWT Claims model and updates JWT-related tests accordingly.

Changes:

• Extend Claims with an optional iss: Option<String> field (omitted during serialization when None).
• Update JWT tests to construct Claims with an iss value.
• Add a new public accessor ApiError::status_code().

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/jwt.rs	Adds optional iss field to JWT claims with conditional serialization.
src/tests/jwt.rs	Updates claim construction in tests to include iss.
src/error.rs	Adds a public status_code() accessor on ApiError.

Comments suppressed due to low confidence (1)

src/tests/jwt.rs:68

• Tests now include iss when constructing Claims, but they never assert that iss round-trips through encode/decode. Consider asserting decoded.iss == Some("test".to_string()) in the valid-token test, and adding a small test case where iss is omitted (None) to ensure backwards compatibility for tokens without an issuer.

fn decode_jwt_valid_token() {
    let secret = "mysecret";
    let claims = Claims {
        prompt: "test prompt".to_string(),
        exp: 9999999999,
        iss: Some("test".to_string()),
    };
    let token = jsonwebtoken::encode(
        &jsonwebtoken::Header::default(),
        &claims,
        &jsonwebtoken::EncodingKey::from_secret(secret.as_bytes()),
    )
    .unwrap();
    let decoded = decode_jwt(&token, secret).unwrap();
    assert_eq!(decoded.prompt, "test prompt");
}

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[Copilot]

The PR description focuses on adding an optional iss claim, but this change also adds a new public API (ApiError::status_code). If this method is required for the JWT issuer work, please update the PR description to mention it; otherwise consider splitting it into a separate PR to keep changes scoped and easier to review/revert.