feat(discovery): GET /api/discover feed

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/src/app/api/discover/route.test.ts

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+import { describe, it, expect } from "vitest";
+import { prisma } from "@/lib/db";
+import { GET } from "./route";
+
+describe("discover feed API", () => {
+  it("returns pending artists and albums split, highest score first, excluding non-pending", async () => {
+    await prisma.discoverySuggestion.createMany({
+      data: [
+        { kind: "artist", artistMbid: "a1", artistName: "Low", score: 0.2, seedCount: 1,
+          sources: ["listenbrainz"], secondaryTypes: [], dedupeKey: "artist:a1:" },
+        { kind: "artist", artistMbid: "a2", artistName: "High", score: 0.9, seedCount: 2,
+          sources: ["listenbrainz"], secondaryTypes: [], dedupeKey: "artist:a2:" },
+        { kind: "album", artistMbid: "a3", artistName: "Band", rgMbid: "rg1", album: "Rec",
+          score: 0.5, seedCount: 1, sources: ["listenbrainz"], secondaryTypes: [], dedupeKey: "album:a3:rg1" },
+        { kind: "artist", artistMbid: "a4", artistName: "Gone", score: 5, seedCount: 1,
+          sources: ["listenbrainz"], secondaryTypes: [], status: "dismissed", dedupeKey: "artist:a4:" },
+      ],
+    });
+    const body = await (await GET()).json();
+    expect(body.artists.map((a: any) => a.artistName)).toEqual(["High", "Low"]); // dismissed excluded
+    expect(body.albums.map((a: any) => a.album)).toEqual(["Rec"]);
+    expect(body.artists[0]).toMatchObject({ artistMbid: "a2", seedCount: 2, sources: ["listenbrainz"] });
+  });
+});

web/src/app/api/discover/route.ts

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+import { prisma } from "@/lib/db";
+
+export async function GET() {
+  const rows = await prisma.discoverySuggestion.findMany({
+    where: { status: "pending" },
+    orderBy: [{ score: "desc" }, { createdAt: "asc" }],
+  });
+  const map = (r: (typeof rows)[number]) => ({
+    id: r.id,
+    artistMbid: r.artistMbid,
+    artistName: r.artistName,
+    rgMbid: r.rgMbid,
+    album: r.album,
+    primaryType: r.primaryType,
+    secondaryTypes: r.secondaryTypes,
+    firstReleaseDate: r.firstReleaseDate,
+    score: r.score,
+    seedCount: r.seedCount,
+    sources: r.sources,
+  });
+  return Response.json({
+    artists: rows.filter((r) => r.kind === "artist").map(map),
+    albums: rows.filter((r) => r.kind === "album").map(map),
+  });
+}