feat: Add Remote TeleBot Discovery & Configuration

- Add discovery API endpoints to TeleBot (probe, initialize, configure, status)
- Add LivenessService for LittleShop connectivity monitoring with 5min shutdown
- Add BotDiscoveryService to LittleShop for remote bot management
- Add Admin UI: DiscoverRemote wizard, RepushConfig page, status badges
- Add remote discovery fields to Bot model (RemoteAddress, RemotePort, etc.)
- Add CheckRemoteStatus and RepushConfig controller actions
- Update Index/Details views to show remote bot indicators
- Shared secret authentication for discovery, BotKey for post-init

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

LittleShop/Services/IBotService.cs

@@ -23,4 +23,6 @@ public interface IBotService
     Task<bool> ValidateBotKeyAsync(string botKey);
     Task<string> GenerateBotKeyAsync();
     Task<bool> UpdatePlatformInfoAsync(Guid botId, UpdatePlatformInfoDto dto);
+    Task<bool> UpdateRemoteInfoAsync(Guid botId, string remoteAddress, int remotePort, string? instanceId, string discoveryStatus);
+    Task<string?> GetBotKeyAsync(Guid botId);
 }