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/mods/core/defs/actions/living.jsonc

@@ -8,6 +8,8 @@
     "needGain": 0.5,
     "roles": ["student", "staff"],
     "weight": 0,
+    // Only during this parallel's sitting, see the day frame.
+    "lunch": true,
   },
   {
     "defName": "UseToilet",

src/HSchool.Server/mods/core/defs/dayframe/standard.jsonc

@@ -6,4 +6,11 @@
   "breakMinutes": 10,
   "longBreakAfter": 3,
   "longBreakMinutes": 20,
+  // Two sittings so the canteen is not the whole school at once: juniors eat after the
+  // third lesson, seniors after the fourth. Both breaks are long because somebody eats in
+  // them. A pack that wants one sitting just drops this list.
+  "lunchBreaks": [
+    { "afterLesson": 3, "gradeMin": 1, "gradeMax": 5 },
+    { "afterLesson": 4, "gradeMin": 6, "gradeMax": 11 },
+  ],
 }

src/HSchool.Server/mods/core/defs/needs/needs.jsonc

@@ -1,6 +1,6 @@
 [
   { "defName": "Sleep", "initial": 1, "decayPerHour": 0.05, "min": 0, "max": 1, "restoredOffCampus": true },
-  { "defName": "Hunger", "initial": 1, "decayPerHour": 0.1, "min": 0, "max": 1 },
+  { "defName": "Hunger", "initial": 1, "decayPerHour": 0.2, "min": 0, "max": 1, "restoredOffCampus": true },
   { "defName": "Toilet", "initial": 1, "decayPerHour": 0.15, "min": 0, "max": 1 },
   { "defName": "Social", "initial": 1, "decayPerHour": 0.08, "min": 0, "max": 1 },
 ]

src/HSchool.Server/mods/core/maps/default.jsonc

@@ -85,7 +85,7 @@
       "floor": "floor-1",
       "slots": [
         { "key": "counter", "thing": "DiningTable" },
-        { "key": "seats", "thing": "Chair", "count": 8 },
+        { "key": "seats", "thing": "Chair", "count": 112 },
       ],
     },
     { "id": "restroom-1", "def": "Restroom", "building": "main", "floor": "floor-1", "label": "1" },