[Copilot]

CI / backend (pull_request) failed to compile rest-api because rsa::pkcs1v15 was imported but not enabled in the resolved rsa build. This PR aligns dependency resolution to stable rsa and explicitly enables the required feature where used.

• Root cause

  • rest-api/src/services/clerk/account_checker.rs uses rsa::pkcs1v15::Pkcs1v15Sign.
  • The resolved crate config did not expose pkcs1v15, causing E0432 unresolved import in CI.

• Dependency alignment

  • Updated backend workspace rsa from RC to stable (0.10.0) in backend/Cargo.toml.
  • Enabled pkcs1v15 on rest-api’s rsa dependency in backend/rest-api/Cargo.toml.

• Lockfile update

  • Refreshed backend/Cargo.lock to reflect stable rsa and its transitive dependency set.

# backend/Cargo.toml
rsa = "0.10.0"

# backend/rest-api/Cargo.toml
rsa = { workspace = true, features = ["pkcs1v15"] }