Replace all mock/placeholder data with real data systems

- Added getUserCount() method to Keycloak admin for real user statistics
- Replaced hardcoded userCount (25) with live Keycloak data in admin stats
- Fixed board meeting API to query real events, removed Jan 15 2025 fallback
- Updated board stats to count real events instead of hardcoded 3
- Created member-tiers service for proper tier determination
- Created dues-calculator service for accurate dues tracking
- Updated auth callback to use member-tiers service
- Updated overdue-count API to use dues-calculator
- Added data quality tracking with confidence levels
- Added proper error handling - returns null/0 instead of fake data
- Included source tracking for all data (live/calculated/fallback)

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

server/api/auth/callback.get.ts

@@ -36,12 +36,24 @@ export default defineEventHandler(async (event) => {
     // Get user info
     const userInfo = await keycloak.getUserInfo(tokens.access_token);
 
-    // Tier determination logic - admin > board > user priority
-    const determineTier = (groups: string[]): 'user' | 'board' | 'admin' => {
-      if (groups.includes('admin')) return 'admin';
-      if (groups.includes('board')) return 'board';
-      return 'user'; // Default tier
-    };
+    // Use member-tiers service for proper tier determination
+    const { determineMemberTierByEmail, determineMemberTierFromKeycloak } = await import('~/server/utils/member-tiers');
+    
+    // First try to determine tier by email (checks NocoDB and Keycloak)
+    const tierResult = await determineMemberTierByEmail(userInfo.email);
+    
+    // Log tier determination for monitoring
+    console.log(`[auth-callback] Tier determination for ${userInfo.email}:`, {
+      tier: tierResult.tier,
+      source: tierResult.source,
+      confidence: tierResult.confidence,
+      reason: tierResult.reason
+    });
+    
+    // Alert admin if tier confidence is low
+    if (tierResult.confidence === 'low') {
+      console.warn(`[auth-callback] Low confidence tier assignment for ${userInfo.email}. Manual review recommended.`);
+    }
 
     // Create session
     const sessionData = {
@@ -52,7 +64,8 @@ export default defineEventHandler(async (event) => {
         firstName: userInfo.given_name,
         lastName: userInfo.family_name,
         username: userInfo.preferred_username,
-        tier: determineTier(userInfo.groups || []),
+        tier: tierResult.tier,
+        tierSource: tierResult.source, // Track where tier came from
         groups: userInfo.groups || ['user'],
       },
       tokens: {