1. App.tsx: add restoreSession() call on startup to prevent redirect
to login page after refresh (isRestoring guard + BootstrapScreen)
2. CloneManager: call syncAgents() after loadClones() to restore
currentAgent and conversation history on app load
3. zclaw-memory: add get_or_create_session() so frontend session UUID
is persisted directly — kernel no longer creates mismatched IDs
4. openai.rs: assistant message content must be non-empty for
Kimi/Qwen APIs — replace empty content with meaningful placeholders
Also includes admin-v2 ModelServices unified page (merge providers +
models + API keys into expandable row layout)
