feat: analysis providers, settings UI, song search, WAV duration fix

- Multi-provider AI analysis (Anthropic, OpenAI, Ollama, Algorithmic)
- server-only guards on all provider files; client bundle fix
- /settings page with provider status, Ollama model picker, preferences
- Song search box on /analyze replacing raw MBID input (debounced, keyboard nav)
- Auto-register song via MusicBrainz on POST /api/tracks (no more 404)
- Fix WAV duration bug: last section songEnd was double-counting elapsed time
- Registry sync comment updated for self-hosted HTTPS git servers

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

components/settings/OllamaModelPicker.tsx

@@ -0,0 +1,63 @@
+"use client";
+
+import { RECOMMENDED_OLLAMA_MODELS } from "@/lib/analysis/constants";
+
+interface OllamaModelPickerProps {
+  models: string[];
+  value: string;
+  onChange: (model: string) => void;
+  onRefresh: () => void;
+  refreshing: boolean;
+}
+
+export default function OllamaModelPicker({
+  models,
+  value,
+  onChange,
+  onRefresh,
+  refreshing,
+}: OllamaModelPickerProps) {
+  if (models.length === 0) {
+    return (
+      <p className="text-sm text-zinc-500">
+        No models found. Pull a model with{" "}
+        <code className="text-zinc-400">ollama pull qwen2.5:7b</code> and refresh.
+      </p>
+    );
+  }
+
+  return (
+    <div className="space-y-3">
+      <div className="flex flex-col gap-2">
+        {models.map((model) => {
+          const isRecommended = RECOMMENDED_OLLAMA_MODELS.includes(model);
+          return (
+            <label key={model} className="flex items-center gap-3 cursor-pointer group">
+              <input
+                type="radio"
+                name="ollama-model"
+                value={model}
+                checked={value === model}
+                onChange={() => onChange(model)}
+                className="accent-green-500"
+              />
+              <span className="text-sm text-zinc-300 group-hover:text-zinc-100 transition-colors">
+                {model}
+              </span>
+              {isRecommended && (
+                <span className="text-xs text-amber-400">★ recommended</span>
+              )}
+            </label>
+          );
+        })}
+      </div>
+      <button
+        onClick={onRefresh}
+        disabled={refreshing}
+        className="text-xs text-zinc-500 hover:text-zinc-300 underline disabled:opacity-50"
+      >
+        {refreshing ? "Refreshing…" : "Refresh model list"}
+      </button>
+    </div>
+  );
+}