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/api/v1/journal/entries/route.ts

@@ -0,0 +1,20 @@
+import { apiJson, withApiHandler } from "@/lib/api-handler";
+import { createJournalEntryForScope } from "@/modules/journal/server/actions";
+import { journalEntryInput } from "@/modules/journal/server/schemas";
+import { listJournalEntriesForScope } from "@/modules/journal/server/queries";
+
+export async function GET(request: Request) {
+  return withApiHandler(request, async (scope) => {
+    const entries = await listJournalEntriesForScope(scope);
+    return apiJson(entries);
+  });
+}
+
+export async function POST(request: Request) {
+  return withApiHandler(request, async (scope, req) => {
+    const body: unknown = await req.json();
+    const parsed = journalEntryInput.parse(body);
+    const entry = await createJournalEntryForScope(scope, parsed);
+    return apiJson(entry, 201);
+  });
+}