feat(core): implement StaticConfig, DynamicConfig, AuthPolicy, ApiKeyEntry, RateLimitConfig, ConfigReloadHandle, TlsIdentity, ConfigError (task: core/config)
Implement all configuration types in config.rs: StaticConfig (drain_timeout=2s
default), TlsIdentity (X509/RawKey[iroh-gated]/SelfSigned), DynamicConfig
(Clone/Debug/Default, ArcSwap-reloadable), AuthPolicy (String fingerprints, no
russh), ApiKeyEntry (5 fields), RateLimitConfig (100/5 defaults),
ConfigReloadHandle (reload/dynamic via ArcSwap), ConfigError (thiserror, all
variants). iroh_relay and RawKey feature-gated to iroh. 14 unit tests.
Refs: docs/architecture/crates/core/config.md
Implements: ADR-003, ADR-010
# Conflicts:
# crates/alknet-core/src/config.rs
glm-5.2
da5646bf46