feat(nostr-vpn): package paid-exit seller + web control panel as manifest apps

Phase 1 of docs/nostr-vpn-integration-plan.md's Phase 0->4 plan (seller-side
rootless feasibility already confirmed there). Two apps, one image:

- apps/nostr-vpn: the daemon. Own network namespace (container.network:
  pasta), NET_ADMIN+NET_RAW scoped to that netns, /dev/net/tun, and the
  net.ipv4.ip_forward sysctl via the primitive added in e42bd26. UDP 51822
  (not upstream's default 51820, which collides with archipelago-wg on
  fleet nodes per the Phase 0 log). Seller mode stays off until an operator
  explicitly enables it (paid_exit.enabled defaults to false upstream).
- apps/nostr-vpn-web: the control panel, gated behind 127.0.0.1:38080,
  talking to the daemon only through the shared /data volume (state-file
  status + shelling out to the nvpn CLI) -- no network link between the
  two containers, matching upstream's own umbrel/docker-compose.yml.
- docker/nostr-vpn: upstream's umbrel/Dockerfile, unchanged except for how
  the pinned commit arrives (shallow git fetch of a verified SHA, since
  codeload.github.com archive tarballs 404 from this environment and
  GitHub won't fetch an arbitrary SHA directly). Entrypoint seeds a minimal
  config.toml with the chosen listen_port on first boot only -- every
  AppConfig field is `serde(default = ...)`, confirmed by reading
  nostr-vpn-core directly, so this merges with nvpn's own identity/wallet
  bootstrap instead of needing a generated_secrets entry or full config
  template, and never touches a config that already exists.

Both volumes point at /var/lib/archipelago/nostr-vpn, adopting state from
the old root-mode install. Build and the seed-config path were verified
against the real `nvpn daemon` binary, not just read -- see the plan doc's
Phase 1 log for what that caught (a fabricated commit SHA, the codeload
404, wrong default branch name, and confirming identity/wallet persistence
actually survives container recreation).

Not done here, flagged in the plan doc instead: removing the old root-mode
path (rpc/vpn.rs, rpc/auth.rs's auto-enable-on-login) touches live
onboarding on every node, not just this app -- needs explicit sign-off.
Also missing: a stop-hook/uninstall-guard manifest primitive (doesn't
exist yet -- LifecycleHooks only has post_install/pre_start) for the
collect-due-on-stop and non-zero-wallet uninstall guard, and registry
mirroring + catalog signing (need credentials this pass doesn't have).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/nostr-vpn-web/manifest.yml

@@ -0,0 +1,89 @@
+app:
+  id: nostr-vpn-web
+  name: Nostr VPN Control Panel
+  version: 1.0.0
+  upstream:
+    kind: github
+    repo: mmalmi/nostr-vpn
+  description: |
+    Web control panel for the nostr-vpn paid-exit seller (apps/nostr-vpn).
+    Talks to the daemon only through the shared /data volume (state-file
+    status + shelling out to the nvpn CLI) -- no network link between the
+    two containers, mirroring upstream's own umbrel/docker-compose.yml
+    exactly (read directly, not assumed). Same image as apps/nostr-vpn,
+    different entrypoint args.
+  category: money
+
+  container:
+    build:
+      context: /opt/archipelago/docker/nostr-vpn
+      dockerfile: Dockerfile
+      tag: localhost/nostr-vpn:local
+    entrypoint: ["/usr/local/bin/archy-nvpn-entrypoint.sh"]
+    custom_args:
+      - /usr/local/bin/nvpn-web
+      - --listen
+      - 0.0.0.0:38080
+      - --behind-trusted-proxy
+      - --config
+      - /data/config/nvpn/config.toml
+
+  dependencies:
+    - app_id: nostr-vpn
+
+  resources:
+    memory_limit: 128Mi
+
+  security:
+    capabilities: []
+    readonly_root: false
+    no_new_privileges: true
+    network_policy: bridge
+
+  ports:
+    - host: 38080
+      container: 38080
+      protocol: tcp
+      bind: 127.0.0.1
+      auth: gated
+
+  volumes:
+    # Same volume as apps/nostr-vpn, read-write: the panel's wallet/seller
+    # actions (wallet send, paid-exit run) shell out to the nvpn CLI
+    # against this same config.toml and data dir, per
+    # NVPN_EXTERNAL_DAEMON/NVPN_DAEMON_STATUS_MODE below.
+    - type: bind
+      source: /var/lib/archipelago/nostr-vpn
+      target: /data
+      options: [rw]
+
+  environment:
+    - NVPN_CLI_PATH=/usr/local/bin/nvpn
+    - NVPN_DAEMON_STATUS_MODE=state-file
+    - NVPN_EXTERNAL_DAEMON=true
+
+  health_check:
+    type: http
+    endpoint: http://127.0.0.1:38080
+    path: /
+    interval: 30s
+    timeout: 5s
+    retries: 3
+
+  interfaces:
+    main:
+      name: Control Panel
+      description: nostr-vpn paid-exit status, wallet, and seller settings
+      type: ui
+      port: 38080
+      protocol: http
+      path: /
+
+  metadata:
+    category: money
+    tier: optional
+    author: mmalmi
+    repo: https://github.com/mmalmi/nostr-vpn
+    features:
+      - Paid-exit seller status, wallet, and offer controls
+      - Shares state with apps/nostr-vpn via one data volume, no RPC link