fix: make work page stats dynamic from achievements YAML

Replaced hardcoded "4 wins" and "~$10,800" with dynamic values
from Achievement model (auto-calculated from achievements.yml).

Author: rz1989s

app/views/works/index.html.erb

@@ -16,12 +16,12 @@
   <!-- Stats Banner -->
   <div class="work-stats-banner">
     <div class="work-stat">
-      <span class="work-stat-value">4</span>
+      <span class="work-stat-value"><%= Achievement.win_count %></span>
       <span class="work-stat-label">wins</span>
     </div>
     <span class="work-stat-divider">•</span>
     <div class="work-stat">
-      <span class="work-stat-value">~$10,800</span>
+      <span class="work-stat-value">~<%= total_earnings_formatted %></span>
       <span class="work-stat-label">earned</span>
     </div>
     <span class="work-stat-divider">•</span>