feat(tonedownload): Tone3000 NAM + IR browser, real anon key, tests

- Tonedownload.py: Tone3000 API client with search/download/cache/enrich
- Server.py: 4 endpoints (search models, search IRs, install model, install IR)
- Models.html + irs.html: Browse Tone3000 tab with search, trending, offline
- Models.js + irs.js: Tone3000 search UI with install tracking via localStorage
- Style.css: Card layout for search results with thumbnail, meta, install btn
- Tests: 47 tests covering data classes, cache, API, search, download, enrichment
- Anon key: Updated from placeholder to real Supabase anon key (verified: API works)

src/web/templates/models.html

@@ -42,6 +42,26 @@
             <button class="btn btn-primary" onclick="uploadModel()">Upload</button>
         </div>
     </div>
+
+    <div class="card">
+        <div class="card-header">
+            <h2>Browse Tone3000 <span class="badge badge-tone3000">BETA</span></h2>
+        </div>
+        <div class="card-body">
+            <p class="hint">Search and download NAM models directly from the Tone3000 community.</p>
+            <div class="tonedownload-search-row">
+                <input type="text" id="model-tone-search" class="file-input tonedownload-input"
+                       placeholder="Search models (e.g. Marshall JCM800)..." onkeydown="if(event.key==='Enter')searchToneModels()">
+                <button class="btn btn-primary" onclick="searchToneModels()">Search</button>
+                <button class="btn btn-secondary" onclick="loadTrendingModels()">Trending</button>
+            </div>
+            <div id="model-tone-loader" class="loading" style="display:none">Searching Tone3000...</div>
+            <div id="model-tone-offline" class="tonedownload-offline" style="display:none">
+                <span>⚠ Offline — search unavailable</span>
+            </div>
+            <div id="model-tone-results" class="tonedownload-results"></div>
+        </div>
+    </div>
 </div>
 {% endblock %}
 {% block scripts %}