Enhance school day structure and decision-making for lunch breaks

- Updated `ai.md` to clarify the mechanics of hunger restoration and the importance of lunch breaks in the school schedule.
- Revised `schedule.md` to detail the new lunch break structure, allowing for separate sittings for different grade levels.
- Enhanced `Decision.cs` and `DecisionPlanner.cs` to incorporate logic for lunch breaks, ensuring that students only leave lessons during their designated lunch windows.
- Updated `DayFrameDef` and related classes to support multiple lunch breaks and validate their configurations.
- Adjusted tests to validate the new decision-making logic regarding lunch breaks and hunger management, ensuring robust functionality.
- Improved localization strings to reflect changes in the school day structure and lunch functionalities.

src/HSchool.Server/Game/GameLoopService.cs

@@ -281,7 +281,7 @@ internal sealed class GameLoopService(
                 return;
             }
 
-            if (!SchoolRegistry.TryNormalizeName(command.Name, out var normalized))
+            if (!SchoolNames.TryNormalize(command.Name, out var normalized))
             {
                 command.Result.TrySetResult(new SchoolCreationOutcome(null, SchoolCreationError.InvalidName));
                 return;