Add FIDO2/WebAuthn passkey authentication

Phase 14: Full WebAuthn support for passwordless passkey login and
hardware security key 2FA.

- go-webauthn/webauthn v0.16.1 dependency
- WebAuthnConfig with RPID/RPOrigin/DisplayName validation
- Migration 000009: webauthn_credentials table
- DB CRUD with ownership checks and admin operations
- internal/webauthn adapter: encrypt/decrypt at rest with AES-256-GCM
- REST: register begin/finish, login begin/finish, list, delete
- Web UI: profile enrollment, login passkey button, admin management
- gRPC: ListWebAuthnCredentials, RemoveWebAuthnCredential RPCs
- mciasdb: webauthn list/delete/reset subcommands
- OpenAPI: 6 new endpoints, WebAuthnCredentialInfo schema
- Policy: self-service enrollment rule, admin remove via wildcard
- Tests: DB CRUD, adapter round-trip, interface compliance
- Docs: ARCHITECTURE.md §22, PROJECT_PLAN.md Phase 14

Security: Credential IDs and public keys encrypted at rest with
AES-256-GCM via vault master key. Challenge ceremonies use 128-bit
nonces with 120s TTL in sync.Map. Sign counter validated on each
assertion to detect cloned authenticators. Password re-auth required
for registration (SEC-01 pattern). No credential material in API
responses or logs.

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

internal/policy/policy.go

@@ -48,6 +48,9 @@ const (
 
 	ActionListRules   Action = "policy:list"
 	ActionManageRules Action = "policy:manage"
+
+	ActionEnrollWebAuthn Action = "webauthn:enroll" // self-service
+	ActionRemoveWebAuthn Action = "webauthn:remove" // admin
 )
 
 // ResourceType identifies what kind of object a request targets.
@@ -60,6 +63,7 @@ const (
 	ResourceAuditLog ResourceType = "audit_log"
 	ResourceTOTP     ResourceType = "totp"
 	ResourcePolicy   ResourceType = "policy"
+	ResourceWebAuthn ResourceType = "webauthn"
 )
 
 // Effect is the outcome of policy evaluation.