fix(jet1090): reconnect live SDR sources

[xoolive]

Closes #533

Dependency

Depends on the Desperado 0.5 lifecycle work, including desperado#50. During co-development this branch uses the sibling ../desperado checkout rather than pinning a transient commit.

Summary

• replace one-shot RTL-SDR, Airspy, HackRF, and SoapySDR tasks with a shared, shutdown-aware reconnect supervisor;
• propagate fallible SDR initialization and terminal IQ stream errors to the source-health dashboard;
• transition sources through Connecting, Healthy, and Reconnecting with capped exponential backoff;
• call IqAsyncSource::stop().await on every live-source exit for deterministic cleanup;
• return unsupported live sample rates as errors rather than panicking;
• leave IQ-file EOF as normal completion.

Validation

• cargo test --all-features
• cargo build --release --all-features
• cargo clippy --workspace --all-targets --all-features -- -D warnings
• manually validated reconnect behavior with RTL-SDR, Airspy, and HackRF.

SoapySDR manual validation remains pending.

[xoolive]

@abc8747 you want to try?
@johnletey that extends #531 to SDR dongles

[abc8747]

Works well!