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

Core/Validation/Rules/StudentRankingRules/NoRegionalEventRule.cs

@@ -0,0 +1,22 @@
+using Core.Entities;
+using Core.Validation.Rules.BaseRules;
+
+namespace Core.Validation.Rules.StudentRankingRules;
+
+/// <summary>
+/// Validation rule that checks if a student has ranked at least one regional event
+/// </summary>
+public class NoRegionalEventRule : RequiredEventTypeRuleBase
+{
+    protected override bool IsRequired(ValidationConfiguration config) => config.RequireRegionalEvent;
+
+    protected override bool HasEventType(Student student) => student.RankedEvents.Any(e => e.RegionalEvent);
+
+    protected override ValidationSeverity GetSeverity(ValidationConfiguration config) => config.NoRegionalEventSeverity;
+
+    protected override string Code => "NO_REGIONAL_EVENT";
+
+    protected override string Message => "No Regional Event";
+
+    protected override string IconIdentifier => "RegionalEvent";
+}