Feature: 3 Community-Features — Foto-Challenge, Stamm-Gassis, Rassen-Chip (SW by-v700)

- Foto-Challenge der Woche: DB-Tabellen, routes/challenges.py (current/submit/vote/winners),
  Scheduler-Job jeden Montag 08:00, walks.js Challenge-Tab mit Banner, Galerie, Voting-Herz
- Gassi-Zeiten-Pool: DB-Tabelle gassi_zeiten, routes/gassi_zeiten.py (CRUD + Umkreis),
  walks.js Stamm-Gassis-Tab mit Karten, Wochentag-Selector, Mitmachen→Chat
- Rassen-Treffen-Chip: GET /api/friends/same-breed, dog-profile.js zeigt Chip
  wenn andere User gleiche Rasse haben, Klick → Forum mit Rassen-Suche vorausgefüllt

backend/static/js/pages/dog-profile.js

@@ -97,8 +97,11 @@ window.Page_dog_profile = (() => {
         <h2 style="font-size:var(--text-2xl);font-weight:700;
                    color:var(--c-text);margin:0 0 var(--space-1)">${_esc(dog.name)}</h2>
         ${dog.rasse
-          ? `<p style="color:var(--c-text-secondary);margin:0 0 var(--space-5)">${_esc(dog.rasse)}</p>`
-          : `<p style="margin:0 0 var(--space-5)"></p>`}
+          ? `<p style="color:var(--c-text-secondary);margin:0 0 var(--space-2)">${_esc(dog.rasse)}</p>`
+          : `<p style="margin:0 0 var(--space-2)"></p>`}
+
+        <!-- Rassen-Community-Chip (wird async geladen) -->
+        <div id="dp-same-breed-chip" style="margin-bottom:var(--space-4)"></div>
 
         <!-- Info-Grid -->
         <div style="display:grid;grid-template-columns:1fr 1fr;gap:var(--space-3);
@@ -245,6 +248,9 @@ window.Page_dog_profile = (() => {
     // Pflegetipps laden
     _loadPflegeTipps(dog);
 
+    // Rassen-Community-Chip laden (falls Rasse bekannt)
+    if (dog.rasse) _loadSameBreedChip();
+
     // Sitter-Zugang laden (nur für Besitzer)
     if (dog.user_id === _appState.user?.id) {
       _loadSittingAccess(dog.id);
@@ -2386,6 +2392,32 @@ window.Page_dog_profile = (() => {
   }
 
 
+  // ----------------------------------------------------------
+  // RASSEN-COMMUNITY-CHIP
+  // ----------------------------------------------------------
+  async function _loadSameBreedChip() {
+    const el = document.getElementById('dp-same-breed-chip');
+    if (!el) return;
+    try {
+      const data = await API.get('friends/same-breed');
+      if (!data || data.count === 0) return;
+      const hauptRasse = data.rassen[0]?.rasse || '';
+      const label = data.count === 1
+        ? `1 anderer ${_esc(hauptRasse)}-Halter in der App`
+        : `${data.count} andere ${_esc(hauptRasse)}-Halter in der App`;
+
+      el.innerHTML = `
+        <button class="breed-community-chip" id="dp-breed-chip-btn">
+          🐕 ${label} &mdash; Forum ansehen
+        </button>
+      `;
+      document.getElementById('dp-breed-chip-btn')?.addEventListener('click', () => {
+        App.navigate('forum', false, { search: hauptRasse });
+      });
+    } catch {}
+  }
+
+
   // ----------------------------------------------------------
   // PUBLIC
   // ----------------------------------------------------------