Atlas: Logistik-Gerüst + Heli-Fix + Waypoints-Regen + Level-Picker

- Neues Modul 'Logistik Europa': module_info-Eintrag, Landing-Card,
  PHP-Wrapper (logistik.php, modul-logistik.php), Engine-Skelett mit
  Enums + Helpern (travelCost, latePenalty, Bonus, Dijkstra,
  Polyline-Interpolation), Test-Harness, Kompetenzen-Draft,
  5 Seed-Dateien (locations, vehicle-types, cargo-types, railnet,
  contract-templates), 3 Level-Einträge in game_levels, Phase 0 durch
  die Logistik-Instanz geliefert und Atlas-Review bestanden
- Heli-Fix: heli-game.php mit BASE_PATH (production-sicher) +
  Asset-Pfad-Injection, geo_waypoints-Tabelle per Seed-Script
  auffindbar gemacht
- Waypoints-Regen-Tool: regen-waypoints-sql.php synchronisiert
  waypoints.sql aus DB (70 Einträge)
- Design-System: .ggs-level-grid / .ggs-level-card als Standard
  gepromotet (Klimas Muster, iPad-hover-safe)
- Inbox-Nachrichten: Kickoff-Briefings für Heli und Logistik,
  Asset-Map für Heli, DALL-E-Pipeline-Anleitung, Koordinations-
  nachrichten an Fluss, Klima, Glossar, Lehrplan

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

App/assets/css/design-system.css

@@ -421,6 +421,34 @@ button, a, input, select, textarea {
 .ggs-badge.level-medium { background: #fff3cd; color: #856404; }
 .ggs-badge.level-hard   { background: #f8d7da; color: #721c24; }
 
+/* --- 9b. Stufen-Auswahl (Level-Picker) --- */
+.ggs-level-grid {
+  display: grid;
+  grid-template-columns: repeat(3, 1fr);
+  gap: 12px;
+  margin: 16px 0;
+}
+.ggs-level-card {
+  background: var(--ggs-bg);
+  border: 2px solid var(--ggs-border);
+  border-radius: var(--ggs-radius-md);
+  padding: 14px 10px;
+  cursor: pointer;
+  text-align: center;
+  transition: all var(--ggs-duration) var(--ggs-ease);
+}
+@media (hover: hover) {
+  .ggs-level-card:hover {
+    border-color: var(--ggs-fjord);
+    transform: translateY(-2px);
+    box-shadow: var(--ggs-shadow-md);
+  }
+}
+.ggs-level-card .em  { font-size: 34px; display: block; margin-bottom: 4px; }
+.ggs-level-card .lbl { font-size: 14px; font-weight: 800; color: var(--ggs-fjord-dark); }
+.ggs-level-card .sub { font-size: 10px; color: var(--ggs-text-muted); margin-top: 4px; line-height: 1.3; }
+.ggs-level-card .ggs-badge { margin-top: 6px; display: inline-block; }
+
 
 /* --- 10. Graph-Card (Zeitverlauf) --- */
 .ggs-graph-card {