Add comprehensive validation system with runtime configuration

Implements a flexible validation framework for student rankings, team assignments, and team composition with administrator-configurable rules and thresholds.

Validation System:
- Reflection-based rule discovery eliminates manual registration
- Base classes (RequiredEventTypeRuleBase, EventCountThresholdRuleBase) reduce code duplication by ~250 lines
- 12 validation rules covering event requirements, counts, and team constraints
- Configurable severity levels (Warning/Error) per rule type
- ValidationService with caching for optimal performance
- Rules apply contextually (StudentRanking, StudentAssignment, TeamComposition)

Configuration & Admin UI:
- ValidationSettings admin page for editing thresholds and severity levels
- ChapterSettings admin page for editing chapter information
- Settings stored in Data/appsettings.json for runtime configuration
- JSON config works in both development and production environments
- Auto-creates Data directory and config template on first run

User Experience:
- ValidationWarnings component displays inline warnings/errors
- Integrated in Event Ranking, Registration, and Team Assignment pages
- Color-coded severity indicators (warning yellow, error red)
- Includes "Too Many Regional Events" rule (max 3 recommended)

Technical Improvements:
- Template Method pattern for rule base classes
- Singleton rule instances with lazy initialization
- Configuration loaded via IConfiguration with fallback to defaults
- Safe JSON updates preserve other appsettings sections

WebApp/Components/Features/Events/Components/EventAttributes.razor

@@ -1,6 +1,12 @@
 @using WebApp.Models
 
+<span style=""></span>
+@if (EventDefinition.LevelOfEffort.HasValue)
+{
+    <span class="numberCircle">@EventDefinition.LevelOfEffort</span>
+}
 <MudText Style="font-family: monospace; white-space: pre;">
+    
     @foreach (var charStr in _attributes.Select(c => c.ToString()))
     {
         if (AppIcons.IconTooltips.TryGetValue(charStr, out var tooltip))
@@ -23,9 +29,7 @@
 
     protected override void OnParametersSet()
     {
-        _attributes = AppIcons.LevelOfEffortIcon(EventDefinition.LevelOfEffort);
-        _attributes += " ";
-        _attributes += EventDefinition.EventFormat == EventFormat.Individual ? AppIcons.IndividualEvent : " ";
+        _attributes = EventDefinition.EventFormat == EventFormat.Individual ? AppIcons.IndividualEvent : " ";
         _attributes += EventDefinition.OnSiteActivity ? AppIcons.OnSiteActivity : " ";
         _attributes += EventDefinition.RegionalEvent ? AppIcons.RegionalEvent : " ";
         _attributes += EventDefinition.InterviewOrPresentation ? AppIcons.PresentationEvent : " ";