feat(cli): automation bundle + identity-minimization features

Reduces manual setup steps and trims user-identifying data exposed by the
server/client, in the spirit of the deployment story: an operator on the
wire sees less, and the admin types fewer commands.

New CLI subcommands:
- `aura server-init`: one shot — pki init + issue-server + writes a ready
  server.toml with auto-detected egress iface; flags --enable-knock,
  --enable-cover-traffic, --no-nat, --run-as toggle the new transport
  defenses and privilege drop.
- `aura provision-client`: issues a client cert and assembles the full
  bundle (ca.crt + client.crt + client.key + client.toml in one directory)
  ready to hand over to the client device. --id is optional (defaults to
  a fresh UUIDv4, so client identities don't have to encode anything real).

Identity / log minimization:
- `aura pki issue-client --id` is now optional — UUIDv4 by default.
- `[server]/[client] no_logs = true` filters peer_id, client_ip,
  source_addr, client_id, local_ip, user, id, assigned_ip, peer field
  values through a custom tracing FormatFields layer (events still fire
  but the identifying fields are redacted before being written).
- `[client] bridges = [...]`: secondary server addresses; build_dial_targets
  shuffles them after the primary, so blocking one IP doesn't kill the
  client.
- Auto-detect egress iface in [server.nat] (via detect_default_egress_iface);
  egress_iface in config becomes optional with graceful fallback.

Config examples updated; backward-compatible (all new sections optional with
serde defaults). Workspace: 207 tests passed (+22), clippy -D warnings clean,
fmt clean. No new workspace deps.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

crates/aura-cli/src/lib.rs

@@ -16,8 +16,11 @@ pub mod admin;
 pub mod bench;
 pub mod client;
 pub mod config;
+pub mod dial_targets;
+pub mod init;
 pub mod masks;
 pub mod nat;
+pub mod no_logs;
 pub mod os_routes;
 pub mod pki;
 pub mod pool;