[Contracts] Add stream_count view function

[ogazboiz]

https://t.me/+DOylgFv1jyJlNzM0

Description

The contract has no way to report how many streams exist, making cursor-based or offset pagination impossible without a full DB scan on the backend. A simple stream_count() -> u64 view function that returns the global stream counter enables the backend (and any external indexer) to implement correct pagination without an extra DB roundtrip.

Acceptance Criteria

• stream_count(env: Env) -> u64 read-only function is implemented
• The value returned is the monotonically-increasing stream ID counter (i.e. total streams ever created, not just active ones)
• Function does not panic on a freshly-deployed contract (returns 0)
• Unit test: assert count increments by 1 after each create_stream call
• TypeScript bindings regenerated

Files to Touch

• contracts/flowfi/src/lib.rs — add stream_count function
• contracts/flowfi/src/test.rs — unit test
• packages/sdk/src/index.ts — regenerated bindings

[dubemoyibe-star]

@dubemoyibe-star has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hey can I work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @dubemoyibe-star to this issue.

[drips-wave]

Congratulations, @dubemoyibe-star! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @dubemoyibe-star: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊