Add Elysia API scaffold

apps/api/src/config/env.ts

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+export const env = {
+  port: Number(Bun.env.API_PORT ?? 3000),
+  databaseUrl: Bun.env.DATABASE_URL,
+};

apps/api/src/db/client.ts

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+import { drizzle } from 'drizzle-orm/postgres-js';
+import postgres from 'postgres';
+import { env } from '../config/env';
+import * as schema from './schema';
+
+export function createDbClient() {
+  if (!env.databaseUrl) {
+    throw new Error('DATABASE_URL is required to create a database client');
+  }
+
+  const client = postgres(env.databaseUrl);
+  return drizzle(client, { schema });
+}

apps/api/src/db/schema.ts

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+import { pgTable, timestamp, uuid, varchar } from 'drizzle-orm/pg-core';
+
+export const appEvents = pgTable('app_events', {
+  id: uuid('id').primaryKey().defaultRandom(),
+  name: varchar('name', { length: 120 }).notNull(),
+  createdAt: timestamp('created_at', { withTimezone: true }).notNull().defaultNow(),
+});

apps/api/src/index.ts

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+import { Elysia } from 'elysia';
+import { env } from './config/env';
+import { healthRoutes } from './routes/health';
+import { statusRoutes } from './routes/status';
+
+const app = new Elysia().use(healthRoutes).use(statusRoutes).listen(env.port);
+
+console.log(`ZeaVis Edu API running at http://${app.server?.hostname}:${app.server?.port}`);
+
+export type App = typeof app;

apps/api/src/routes/health.ts

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+import { Elysia } from 'elysia';
+
+export const healthRoutes = new Elysia().get('/health', () => ({
+  status: 'ok' as const,
+}));

apps/api/src/routes/status.ts

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+import { createAppStatus } from '@zeavis/shared';
+import { Elysia } from 'elysia';
+
+export const statusRoutes = new Elysia({ prefix: '/api/v1' }).get('/status', () =>
+  createAppStatus(),
+);