feat(admin): music library admin + fix CRM analytics UTC

- /admin/music: list / upload / delete studio audio tracks (content-svc
  GET/POST/DELETE /v1/music) — fills the legacy music-library gap
- fix: CRM analytics coerced query-bound dates to UTC (Npgsql timestamptz
  rejects Kind=Unspecified) — endpoint was returning 400

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/[locale]/admin/layout.tsx

@@ -22,6 +22,7 @@ export default async function AdminLayout({
     { href: "/admin/ranking", label: t("ranking") },
     { href: "/admin/tags", label: t("tags") },
     { href: "/admin/fonts", label: t("fonts") },
+    { href: "/admin/music", label: t("music") },
     { href: "/admin/blogs", label: t("blogs") },
     { href: "/admin/slides", label: t("slides") },
     { href: "/admin/files", label: t("media") },

src/app/[locale]/admin/music/page.tsx

@@ -0,0 +1,8 @@
+"use client";
+
+import { AdminResource } from "@/components/admin/AdminResource";
+import { musicConfig } from "@/components/admin/admin-resources";
+
+export default function Page() {
+  return <AdminResource config={musicConfig} />;
+}

src/components/admin/admin-resources.tsx

@@ -109,6 +109,34 @@ export const fontsConfig: ResourceConfig = {
   ],
 };
 
+export const musicConfig: ResourceConfig = {
+  title: "Music",
+  description: "Audio tracks available in the studio music library.",
+  basePath: "music",
+  listKey: "items",
+  canCreate: true,
+  canEdit: false,
+  canDelete: true,
+  columns: [
+    { key: "name", label: "Name" },
+    { key: "genre", label: "Genre" },
+    { key: "mood", label: "Mood" },
+    { key: "duration_sec", label: "Duration (s)" },
+    { key: "is_premium", label: "Premium", render: (r) => badge(!!r.is_premium, "premium", "free") },
+  ],
+  fields: [
+    { key: "name", label: "Name", required: true },
+    { key: "caption", label: "Caption" },
+    { key: "keywords", label: "Keywords" },
+    { key: "url", label: "Audio file", type: "file", required: true },
+    { key: "duration_sec", label: "Duration (seconds)", type: "number", required: true },
+    { key: "bpm", label: "BPM", type: "number" },
+    { key: "genre", label: "Genre" },
+    { key: "mood", label: "Mood" },
+    { key: "is_premium", label: "Premium", type: "checkbox" },
+  ],
+};
+
 export const blogsConfig: ResourceConfig = {
   title: "Blog Posts",
   description: "CMS articles (also created by the AI SEO generator).",