feat: rootless podman, session hardening, boot stability, sidebar fix

Rootless podman migration (TASK-11):
- Remove sudo from all podman calls in PodmanClient + 8 backend files
- Remove sudo from all podman/docker calls in deploy script
- Restore full systemd security hardening: NoNewPrivileges,
  RestrictAddressFamilies, MemoryDenyWriteExecute, RestrictRealtime,
  RestrictNamespaces, RestrictSUIDSGID, SystemCallFilter, ProtectSystem=strict
- Enable loginctl linger for rootless container persistence
- Remove Ollama from auto-deploy (marketplace-only)

Session & auth hardening:
- Increase MAX_CONCURRENT_SESSIONS 20→50 (prevents eviction storms)
- Debounced 401 redirect in rpc-client.ts (prevents redirect storms)

Boot stability:
- optimize-debian.sh: adds chrony, swap, removes policy-rc.d
- deploy script: pre-restart chrony + swap setup
- ISO build: chrony package, swap file creation
- BootScreen: no longer clears localStorage (prevents splash replay)
- RootRedirect: sole owner of localStorage clearing on server ready

UI fixes:
- Sidebar opacity default changed from 0→visible (fixes missing sidebar
  after page-persistence login without entrance animation)
- Console.log/error wrapped in import.meta.env.DEV guards
- Remove unused route import from RootRedirect

Beta tracking:
- CLAUDE.md: beta freeze protocol added
- MASTER_PLAN.md: TASK-11, TASK-17, phase structure
- BETA-PROGRESS.md: initial tracking doc
- Tagged v1.2.0-alpha.1 as pre-rootless baseline

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

image-recipe/configs/archipelago.service

@@ -16,21 +16,31 @@ WatchdogSec=300
 TimeoutStartSec=300
 
 # Filesystem protection
-# ProtectSystem=true protects /usr and /boot only.
-# Cannot use =full or =strict because podman needs write to /etc/containers.
-ProtectSystem=true
+ProtectSystem=strict
 ProtectHome=yes
 PrivateTmp=yes
+ReadWritePaths=/var/lib/archipelago /etc/containers /var/lib/containers /run/containers /run/user /tmp
 
-# Privilege restriction
-# NOTE: NoNewPrivileges, RestrictAddressFamilies, MemoryDenyWriteExecute, and
-# RestrictRealtime are disabled because they all implicitly set the kernel
-# no_new_privs flag, which blocks sudo — required for podman container management.
-# TODO(TASK-11): Migrate to rootless podman, then re-enable all of these.
+# Privilege restriction — restored with rootless podman (no sudo needed)
+NoNewPrivileges=yes
 PrivateDevices=no
 SupplementaryGroups=dialout
 
-# Filesystem protection remains active (ProtectSystem, ProtectHome, PrivateTmp above)
+# Network restriction (allow only IPv4/IPv6 + Unix sockets)
+RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
+
+# Restrict what the process can do
+RestrictNamespaces=yes
+RestrictRealtime=yes
+RestrictSUIDSGID=yes
+
+# Only allow needed syscalls
+SystemCallArchitectures=native
+SystemCallFilter=@system-service
+SystemCallFilter=~@privileged @resources
+
+# Memory protection
+MemoryDenyWriteExecute=yes
 
 # Logging
 StandardOutput=journal