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>

neode-ui/src/views/RootRedirect.vue

@@ -14,12 +14,11 @@
 
 <script setup lang="ts">
 import { ref, onMounted } from 'vue'
-import { useRouter, useRoute } from 'vue-router'
+import { useRouter } from 'vue-router'
 import { isOnboardingComplete } from '@/composables/useOnboarding'
 import BootScreen from '@/components/BootScreen.vue'
 
 const router = useRouter()
-const route = useRoute()
 const showBootScreen = ref(false)
 
 async function quickHealthCheck(): Promise<boolean> {
@@ -66,20 +65,24 @@ async function proceedToApp() {
 }
 
 function onServerReady() {
-  // Clear flags so splash intro plays on reload
+  if (import.meta.env.DEV) console.log('[RootRedirect] onServerReady — setting flag and reloading')
   localStorage.removeItem('neode_intro_seen')
   localStorage.removeItem('neode_onboarding_complete')
-  // Reload with ?intro=1 so we know to skip boot and let App.vue handle splash
-  window.location.href = '/?intro=1'
+  sessionStorage.setItem('archipelago_from_boot', '1')
+  window.location.href = '/'
 }
 
 onMounted(async () => {
   const devMode = import.meta.env.VITE_DEV_MODE
 
-  // Coming back from boot screen — do nothing, let App.vue's SplashScreen take over
-  if (route.query.intro === '1') {
-    // Clean the URL without navigating
-    window.history.replaceState({}, '', '/')
+  // Coming back from boot screen — let App.vue's SplashScreen take over
+  if (sessionStorage.getItem('archipelago_from_boot') === '1') {
+    return
+  }
+
+  // Splash already completed this session — go to app
+  if (sessionStorage.getItem('archipelago_from_splash') === '1') {
+    proceedToApp()
     return
   }
 
@@ -89,7 +92,7 @@ onMounted(async () => {
     return
   }
 
-  // Boot dev mode — always show boot screen
+  // Boot dev mode — always show boot screen (first load only)
   if (devMode === 'boot') {
     showBootScreen.value = true
     return