Add self-hosted Studio provider runner

[DjDeveloperr]

Summary

• add simdeck provider connect/run/status commands for self-hosted Studio Mac providers
• add a long-running provider runner that heartbeats to Studio, polls allocation/release jobs, clones simulators from a template, downloads artifacts, installs/launches apps, and proxies host-scoped RPC requests
• document the new provider commands and include focused provider runner tests

Verification

• npm run format:check
• npm run test:studio-provider
• cargo test --manifest-path server/Cargo.toml
• cargo clippy --manifest-path server/Cargo.toml --all-targets -- -D warnings
• npm run build:cli
• ./build/simdeck provider --help
• npm run lint