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/api/rpc-client.ts

@@ -21,6 +21,7 @@ function getCsrfToken(): string | null {
 }
 
 class RPCClient {
+  private static _sessionExpiredRedirecting = false
   private baseUrl: string
 
   constructor(baseUrl: string = '/rpc/v1') {
@@ -55,9 +56,16 @@ class RPCClient {
         clearTimeout(timeoutId)
 
         if (!response.ok) {
-          // Session expired — redirect to login
+          // Session expired — debounced redirect to login
+          // Use a single shared timeout to prevent redirect storms when
+          // multiple parallel requests all get 401 at once
           if (response.status === 401 && method !== 'auth.login') {
-            window.location.href = '/login'
+            if (!RPCClient._sessionExpiredRedirecting) {
+              RPCClient._sessionExpiredRedirecting = true
+              setTimeout(() => {
+                window.location.href = '/login'
+              }, 300)
+            }
             throw new Error('Session expired')
           }
           const err = new Error(`HTTP ${response.status}: ${response.statusText}`)