feat(netbird): manifest-driven migration via reusable orchestrator primitives

Migrate the netbird stack (server/dashboard/proxy) off ~500 lines of per-app Rust
to 3 declarative manifests, adding 4 reusable primitives:
- SecretGenKind::Base64 (netbird relay authSecret + sqlite store encryptionKey)
- GeneratedCert schema + ensure_manifest_certs (self-signed TLS so the dashboard
  gets a secure context for OIDC PKCE — issue #15; https proxy on 8087 preserved)
- templated GeneratedFile render: {{HOST_IP}}/{{HOST_MDNS}}/{{NETWORK_GATEWAY}}
  (aardvark resolver for the #15 stale-IP fix) /{{secret:NAME}} (never logged)
- legacy create_container now honours port.protocol (3478/udp STUN)
install_netbird_stack routes via the orchestrator first (legacy kept as fallback,
mirroring indeedhub); launch URL derives https://{host_ip}:8087 from host facts.
Legacy Rust deletion deferred to post-live-verify.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

core/archipelago/src/container/docker_packages.rs

@@ -691,16 +691,37 @@ fn extract_lan_address(ports: &[String]) -> Option<String> {
     None
 }
 
+/// netbird's dashboard launch URL: HTTPS on 8087 (the proxy terminates TLS —
+/// the dashboard needs a secure context for OIDC PKCE, issue #15) at the node's
+/// primary host IP so it's reachable from the LAN. Manifest-driven netbird no
+/// longer writes `dashboard.env`, so this is derived from host facts (the same
+/// `{{HOST_IP}}` the orchestrator bakes into the cert/config); it falls back to
+/// the static localhost mapping when the host IP can't be read. URL shape is
+/// identical to the legacy installer's, so the existing https reachability
+/// wrapper still applies.
 async fn netbird_configured_launch_url() -> Option<String> {
-    let env = tokio::fs::read_to_string("/var/lib/archipelago/netbird/dashboard.env")
+    if let Some(ip) = first_host_ip().await {
+        return Some(format!("https://{ip}:8087"));
+    }
+    PodmanClient::lan_address_for("netbird")
+}
+
+/// First address from `hostname -I` — the node's primary host IP. Mirrors the
+/// orchestrator's `detect_host_ip` so launch URLs match the cert/config the
+/// orchestrator renders for `{{HOST_IP}}`.
+async fn first_host_ip() -> Option<String> {
+    let out = tokio::process::Command::new("hostname")
+        .arg("-I")
+        .output()
         .await
         .ok()?;
-    env.lines()
-        .find_map(|line| line.strip_prefix("NETBIRD_MGMT_API_ENDPOINT="))
-        .map(str::trim)
-        .filter(|s| !s.is_empty())
+    if !out.status.success() {
+        return None;
+    }
+    String::from_utf8_lossy(&out.stdout)
+        .split_whitespace()
+        .next()
         .map(ToOwned::to_owned)
-        .or_else(|| PodmanClient::lan_address_for("netbird"))
 }
 
 async fn reachable_lan_address(app_id: &str, candidate: Option<String>) -> Option<String> {