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/lib/db.ts

@@ -5,6 +5,7 @@ import * as calendarSchema from "@/modules/calendar/schema";
 import * as listsSchema from "@/modules/lists/schema";
 import * as notesSchema from "@/modules/notes/schema";
 import * as gardenSchema from "@/modules/garden/schema";
+import * as journalSchema from "@/modules/journal/schema";
 
 const client = postgres(process.env["DATABASE_URL"]!);
 
@@ -14,6 +15,7 @@ const schema = {
   ...listsSchema,
   ...notesSchema,
   ...gardenSchema,
+  ...journalSchema,
 };
 
 export const db = drizzle(client, { schema });