fix(service): escape bind value and parse port as int in seeded config

src/ClaudeMailbox/Cli/ServiceCommands.cs

@@ -60,14 +60,15 @@ public static class ServiceCommands
 
         if (!File.Exists(configPath))
         {
-            var port = ClientCommands.GetOption(args, "--port") ?? "47822";
+            var portStr = ClientCommands.GetOption(args, "--port");
+            var port = int.TryParse(portStr, out var p) ? p : 47822;
             var bind = ClientCommands.GetOption(args, "--bind") ?? "127.0.0.1";
             var dbPath = ClientCommands.GetOption(args, "--db-path") ?? defaultDbPath;
 
             var json = $$"""
             {
               "port": {{port}},
-              "bind": "{{bind}}",
+              "bind": {{System.Text.Json.JsonSerializer.Serialize(bind)}},
               "dbPath": {{System.Text.Json.JsonSerializer.Serialize(dbPath)}}
             }
             """;