fix(orchestrator): generalize launch-port fallback + archival-bitcoin dependency gating

Master-plan backlog §10b/§10c: replace two per-app-hardcoded lookups with
generic, manifest-driven behavior so future apps are covered automatically
instead of needing a code edit.

- extract_lan_address (docker_packages.rs) now skips container-side ports
  that are known non-HTTP (SSH, FTP, common DB ports) instead of blindly
  taking podman's first-listed port. Fixes the whole class of bug the gitea
  SSH-before-web static override was a one-off patch for.
- requires_unpruned_bitcoin (dependencies.rs) now checks the app's own
  manifest for a `bitcoin:archival` dependency declaration first, falling
  back to the old hardcoded id list. electrumx and mempool manifests now
  declare it explicitly as the proof case.

869/869 Rust tests green, catalog drift clean.

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

apps/electrumx/manifest.yml

@@ -22,6 +22,7 @@ app:
     - app_id: bitcoin-knots
       version: ">=26.0"
     - storage: 50Gi
+    - bitcoin:archival
 
   resources:
     cpu_limit: 0

apps/mempool/manifest.yml

@@ -13,6 +13,7 @@ app:
     - app_id: bitcoin-core
       version: ">=24.0"
     - storage: 20Gi
+    - bitcoin:archival
     
   resources:
     cpu_limit: 2