fix(buzz-pair): install rustls ring CryptoProvider before WSS (#7998)

## Summary

- `buzz-pair` panics on any `wss://` relay (including the documented
default `wss://relay.damus.io`) because no rustls `CryptoProvider` is
installed. `ws://` is unaffected.
- Sibling binaries already install ring explicitly
(`crates/buzz-cli/src/lib.rs`) and take a direct `rustls` dep with the
`ring` feature so a unified release build can still select a provider.
- This applies the same two-line pattern to `buzz-pairing-cli`: direct
`rustls` dep (`ring` + `std`) and `install_default()` at the top of
`main()`, before any connection.

Fixes #7927.

## Test plan

- [x] Diff matches the established `buzz-cli` install pattern (same dep
features, same `let _ =` swallow on double-install).
- [x] `cargo build -p buzz-pairing-cli` and `buzz-pair source --relay
wss://relay.damus.io` reaches "Waiting for target" without the rustls
panic.
- [x] `buzz-pair test-vectors` still exits 0 (no WSS, install is a
no-op).

---------

Signed-off-by: Bartok9 <259807879+Bartok9@users.noreply.github.com>

Cargo.lock

@@ -1346,6 +1346,7 @@ dependencies = [
  "futures-util",
  "hex",
  "nostr 0.44.7",
+ "rustls",
  "serde_json",
  "thiserror 2.0.18",
  "tokio",