Update and re-export types

[vladimirvolek]

resolves: #66

[Copilot]

Pull request overview

This PR addresses issue #66 by making the generated blockfrost-openapi model types accessible directly through the blockfrost crate, while also updating the OpenAPI bindings and refreshing related infrastructure.

Changes:

• Re-export blockfrost_openapi from the crate root so consumers can use generated models without adding a second dependency.
• Update blockfrost-openapi to 0.1.88 and adjust JSON-deserialization tests for updated schemas.
• Migrate Nix setup from Niv/default.nix to flakes and update the CI Nix job accordingly.

Reviewed changes

Copilot reviewed 11 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/lib.rs	Re-exports blockfrost_openapi to expose generated model types via the SDK.
src/api/endpoints/governance.rs	Updates test JSON fixtures to match the updated OpenAPI schema (adds deposit).
src/api/endpoints/accounts.rs	Updates test JSON fixtures to match the updated OpenAPI schema (adds deposit).
README.md	Bumps installation snippet version to 1.2.4.
CHANGELOG.md	Adds 1.2.4 release notes (re-export + OpenAPI update).
Cargo.toml	Bumps crate version and updates blockfrost-openapi dependency and feature wiring.
Cargo.lock	Locks updated dependency graph for blockfrost-openapi 0.1.88.
nix/sources.nix	Removed (Niv-based Nix pinning removed).
nix/sources.json	Removed (Niv-based Nix pinning removed).
default.nix	Removed (legacy Nix build entrypoint removed).
flake.nix	Adds flake-based Nix build/dev shell/checks using crane.
flake.lock	Adds locked flake inputs for reproducible Nix builds.
.github/workflows/ci.yaml	Updates Nix CI job to use flakes (nix build + nix flake check).

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