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>

app/api/analyze/test/route.ts

@@ -0,0 +1,134 @@
+import { NextRequest, NextResponse } from "next/server";
+import { z } from "zod";
+
+const TestRequestSchema = z.object({
+  provider: z.string(),
+  ollamaModel: z.string().optional(),
+});
+
+/**
+ * POST /api/analyze/test
+ *
+ * Runs a lightweight probe for a provider to confirm it is working.
+ * Always returns 200 — use the `ok` field to check success/failure.
+ *
+ * Body: { provider: string, ollamaModel?: string }
+ * Response: { ok: true } | { ok: false, error: string }
+ */
+export async function POST(req: NextRequest) {
+  let body: unknown;
+  try {
+    body = await req.json();
+  } catch {
+    return NextResponse.json({ ok: false, error: "Invalid JSON body" });
+  }
+
+  const parsed = TestRequestSchema.safeParse(body);
+  if (!parsed.success) {
+    return NextResponse.json({ ok: false, error: "Missing required field: provider" });
+  }
+
+  const { provider, ollamaModel } = parsed.data;
+
+  try {
+    switch (provider) {
+      case "algorithmic": {
+        return NextResponse.json({ ok: true });
+      }
+
+      case "anthropic": {
+        const apiKey = process.env.ANTHROPIC_API_KEY;
+        if (!apiKey) {
+          return NextResponse.json({ ok: false, error: "ANTHROPIC_API_KEY not set" });
+        }
+        // Minimal 1-token probe
+        const response = await fetch("https://api.anthropic.com/v1/messages", {
+          method: "POST",
+          headers: {
+            "Content-Type": "application/json",
+            "x-api-key": apiKey,
+            "anthropic-version": "2023-06-01",
+          },
+          body: JSON.stringify({
+            model: process.env.ANTHROPIC_MODEL ?? "claude-opus-4-6",
+            max_tokens: 10,
+            messages: [{ role: "user", content: "Reply with the word OK" }],
+          }),
+          signal: AbortSignal.timeout(15000),
+        });
+        if (response.ok) {
+          return NextResponse.json({ ok: true });
+        }
+        const text = await response.text().catch(() => "");
+        return NextResponse.json({
+          ok: false,
+          error: `Anthropic API returned ${response.status}: ${text.slice(0, 200)}`,
+        });
+      }
+
+      case "openai": {
+        const apiKey = process.env.OPENAI_API_KEY;
+        if (!apiKey) {
+          return NextResponse.json({ ok: false, error: "OPENAI_API_KEY not set" });
+        }
+        const baseUrl = process.env.OPENAI_BASE_URL ?? "https://api.openai.com/v1";
+        const model = process.env.OPENAI_MODEL ?? "gpt-4o";
+        const response = await fetch(`${baseUrl}/chat/completions`, {
+          method: "POST",
+          headers: {
+            "Content-Type": "application/json",
+            Authorization: `Bearer ${apiKey}`,
+          },
+          body: JSON.stringify({
+            model,
+            max_tokens: 10,
+            messages: [{ role: "user", content: "Reply with the word OK" }],
+          }),
+          signal: AbortSignal.timeout(15000),
+        });
+        if (response.ok) {
+          return NextResponse.json({ ok: true });
+        }
+        const text = await response.text().catch(() => "");
+        return NextResponse.json({
+          ok: false,
+          error: `OpenAI API returned ${response.status}: ${text.slice(0, 200)}`,
+        });
+      }
+
+      case "ollama": {
+        const baseUrl = process.env.OLLAMA_BASE_URL ?? "http://localhost:11434";
+        if (!ollamaModel) {
+          return NextResponse.json({ ok: false, error: "ollamaModel is required for Ollama test" });
+        }
+        const response = await fetch(`${baseUrl}/v1/chat/completions`, {
+          method: "POST",
+          headers: { "Content-Type": "application/json" },
+          body: JSON.stringify({
+            model: ollamaModel,
+            max_tokens: 10,
+            messages: [{ role: "user", content: "Reply with the word OK" }],
+            stream: false,
+          }),
+          signal: AbortSignal.timeout(30000),
+        });
+        if (response.ok) {
+          return NextResponse.json({ ok: true });
+        }
+        const text = await response.text().catch(() => "");
+        return NextResponse.json({
+          ok: false,
+          error: `Ollama returned ${response.status}: ${text.slice(0, 200)}`,
+        });
+      }
+
+      default:
+        return NextResponse.json({ ok: false, error: `Unknown provider: ${provider}` });
+    }
+  } catch (err) {
+    return NextResponse.json({
+      ok: false,
+      error: err instanceof Error ? err.message : String(err),
+    });
+  }
+}