chore: release v1.7.46-alpha

Follow-up to v1.7.45-alpha closing the remaining tasks identified by the
resilience sweeps + the new bitcoin orphan / install-fail-vanish bugs.

User-visible:
- Health monitor: stop paging on orphaned containers from variant switches
- Install fail: card stays visible (was vanishing) with error message
- Stack pull progress: interpolate 20→70% (was stuck at 20%)
- docker.io → lfg2025 mirror: bitcoin/gitea/nextcloud/valkey

Internal:
- Resilience harness — install-wait uses expected_containers_for, ui+auth
  probes retry with 60s backoff, dep-snapshot fix
- InstallProgress gains optional `message` field (frontend renders it
  when phase is None)

binary  $(stat -c %s releases/v1.7.46-alpha/archipelago)  sha256:$(sha256sum releases/v1.7.46-alpha/archipelago | awk '{print $1}')
tarball $(stat -c %s releases/v1.7.46-alpha/archipelago-frontend-1.7.46-alpha.tar.gz)  sha256:$(sha256sum releases/v1.7.46-alpha/archipelago-frontend-1.7.46-alpha.tar.gz | awk '{print $1}')

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

core/archipelago/src/data_model.rs

@@ -255,6 +255,12 @@ pub struct InstallProgress {
     /// a fixed UI percentage and a descriptive label.
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub phase: Option<InstallPhase>,
+    /// Optional explicit message — used to surface install failures so
+    /// the UI can keep the app card visible with an error description
+    /// instead of silently removing the entry on fail. UI's PHASE_INFO
+    /// label takes precedence when phase is set.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub message: Option<String>,
 }
 
 /// Phases of the install / update pipeline, surfaced to the UI so users