Feature: Vollständige Züchter-Rolle — Antrag, Würfe, Stammbaum, Genetik

Basis-Features (Schritte 1–11):
- Züchter-Antrag mit Dokument-Upload, Admin-Prüfung, E-Mail-Benachrichtigungen
- Öffentliches Züchter-Profil + Karten-Marker (lila, certificate-Icon)
- Wurfverwaltung: Würfe, Welpen, Gewichtsverlauf, Foto-System
- Wurfbörse (öffentlich) mit Filtersuche nach Rasse/Status
- Läufigkeits-Tracker: Deckdatum + Wurftermin (+63 Tage, nur für Züchter)
- Interessenten-Chat: Kontakt-Button in Wurfbörse und Züchter-Profil
- Sidebar-Einträge: Zuchtkartei + Wurfverwaltung für Züchter/Admin

Stammbaum & Genetik (Schritte 1–8):
- Zuchtkartei: Hunde-Stammdaten mit Vater/Mutter-Verknüpfung
- Stammbaum-Visualisierung: 4 Generationen, horizontales CSS-Grid
- Gesundheitstests (HD, ED, OCD, Augen…) mit farbigen Ergebnis-Badges
- Genetische Tests (MDR1, PRA, DM…): clear/carrier/affected
- Titel & Auszeichnungen (CAC, CACIB, IPO…)
- Probeverpaarung: IK-Berechnung nach Wright + Ampel-Bewertung
- Teilen-Link für öffentliche Hunde-Profile
- Kaufvertrag: druckbares HTML-Dokument pro Welpe

Technisch: 4 neue Route-Dateien, 5 neue Page-Module, 11 neue DB-Tabellen,
icons shield-check + certificate + tree-structure im Sprite — SW by-v465, APP_VER 444

backend/static/icons/phosphor.svg

@@ -177,4 +177,13 @@
     <rect width="256" height="256" fill="none"/>
     <path d="M208,32H184V24a8,8,0,0,0-16,0v8H88V24a8,8,0,0,0-16,0v8H48A16,16,0,0,0,32,48V208a16,16,0,0,0,16,16H208a16,16,0,0,0,16-16V48A16,16,0,0,0,208,32ZM152,160H136v16a8,8,0,0,1-16,0V160H104a8,8,0,0,1,0-16h16V128a8,8,0,0,1,16,0v16h16a8,8,0,0,1,0,16ZM48,80V48H72v8a8,8,0,0,0,16,0V48h80v8a8,8,0,0,0,16,0V48h24V80Z"/>
   </symbol>
+  <symbol id="tree-structure" viewBox="0 0 256 256">
+    <path d="M144,96V80H128a8,8,0,0,0-8,8v80a8,8,0,0,0,8,8h16V160a16,16,0,0,1,16-16h48a16,16,0,0,1,16,16v48a16,16,0,0,1-16,16H160a16,16,0,0,1-16-16V192H128a24,24,0,0,1-24-24V136H72v8a16,16,0,0,1-16,16H24A16,16,0,0,1,8,144V112A16,16,0,0,1,24,96H56a16,16,0,0,1,16,16v8h32V88a24,24,0,0,1,24-24h16V48a16,16,0,0,1,16-16h48a16,16,0,0,1,16,16V96a16,16,0,0,1-16,16H160A16,16,0,0,1,144,96Z"/>
+  </symbol>
+  <symbol id="shield-check" viewBox="0 0 256 256">
+    <path d="M208,40H48A16,16,0,0,0,32,56v56c0,52.72,25.52,84.67,46.93,102.19,23.06,18.86,46,25.26,47,25.53a8,8,0,0,0,4.2,0c1-.27,23.91-6.67,47-25.53C198.48,196.67,224,164.72,224,112V56A16,16,0,0,0,208,40Zm-34.32,69.66-56,56a8,8,0,0,1-11.32,0l-24-24a8,8,0,0,1,11.32-11.32L112,148.69l50.34-50.35a8,8,0,0,1,11.32,11.32Z"/>
+  </symbol>
+  <symbol id="certificate" viewBox="0 0 256 256">
+    <path d="M232,86.53V56a16,16,0,0,0-16-16H40A16,16,0,0,0,24,56V184a16,16,0,0,0,16,16H160v24A8,8,0,0,0,172,231l24-13.74L220,231A8,8,0,0,0,232,224V161.47a51.88,51.88,0,0,0,0-74.94ZM128,144H72a8,8,0,0,1,0-16h56a8,8,0,0,1,0,16Zm0-32H72a8,8,0,0,1,0-16h56a8,8,0,0,1,0,16Zm88,98.21-16-9.16a8,8,0,0,0-7.94,0l-16,9.16V172a51.88,51.88,0,0,0,40,0ZM196,160a36,36,0,1,1,36-36A36,36,0,0,1,196,160Z"/>
+  </symbol>
 </svg>