feat(audit): 1.1 — project scaffold, schema types, collector stub, updater trust

- go.mod: module bee/audit
- schema/hardware.go: HardwareIngestRequest types (compatible with core)
- collector/collector.go: Run() stub, logs start/finish, returns empty snapshot
- updater/trust.go: Ed25519 multi-key verification via ldflags injection
- updater/trust_test.go: valid sig, tampered, multi-key any-match, dev build
- cmd/audit/main.go: --output stdout|file:<path>|usb, --version flag
- Version = "dev" by default, injected via ldflags at release

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

audit/go.mod

@@ -0,0 +1,3 @@
+module bee/audit
+
+go 1.23