feat(17-01): add GET /api/health endpoint with DB connectivity check

- Runs SELECT 1 via Drizzle db client
- Returns { ok: true, db: 'connected' } with status 200 on success
- Returns { ok: false, error: message } with status 503 on DB failure
- No auth check — intentionally public for Docker HEALTHCHECK

teressa-copeland-homes/src/app/api/health/route.ts

@@ -0,0 +1,12 @@
+import { db } from '@/lib/db';
+import { sql } from 'drizzle-orm';
+
+export async function GET() {
+  try {
+    await db.execute(sql`SELECT 1`);
+    return Response.json({ ok: true, db: 'connected' });
+  } catch (e) {
+    const message = e instanceof Error ? e.message : 'Unknown error';
+    return Response.json({ ok: false, error: message }, { status: 503 });
+  }
+}