feat(journal): add per-user mood journal module (task 86)

Ship journal entries with mood tracking, insights, and Recharts charts.

Adds v1 API endpoints per ADR 0005 and migration 0020_journal_entries.

src/app/journal/mood/page.tsx

@@ -0,0 +1,21 @@
+import Link from "next/link";
+import { DetailBackLink } from "@/components/detail-back-link";
+import { MoodTrackerView } from "@/modules/journal/components/mood-tracker-view";
+import { listJournalEntries } from "@/modules/journal/server/queries";
+
+export default async function JournalMoodPage() {
+  const entries = await listJournalEntries({ limit: 500 });
+
+  return (
+    <div className="mx-auto grid w-full max-w-5xl gap-4 min-w-0">
+      <DetailBackLink href="/journal" label="Journal" />
+      <div className="flex items-center justify-between gap-3">
+        <h2 className="serif text-[22px] tracking-tight">Mood tracker</h2>
+        <Link href="/journal/insights" className="text-[13px] text-[var(--accent)] hover:underline">
+          View insights
+        </Link>
+      </div>
+      <MoodTrackerView entries={entries} />
+    </div>
+  );
+}