Release agent-v1.1.1

perf: coarsetime + SDK receive buffer reuse + HashMap with_capacity

agent:
- Add coarsetime dep; start Updater in main()
- transfer.rs: replace std::time entirely with coarsetime::{Clock, Instant}
- transfer.rs: HdrCache + len_hint AtomicUsize idle fast-path

SDK/rust:
- server.rs: on_record(&[u8]) + scratch buffer reuse (zero per-frame alloc)

plugins/edriver:
- Cargo.toml: add coarsetime dep
- bpfmgr.rs: coarsetime replaces SystemTime in event loop + heartbeat
- events: Fields::with_capacity on all 18 parse functions