M0: foundation — monorepo, PostGIS schema, deck query, app shell

Greenfield scaffold for Linkder, a swipe-to-hire marketplace for local
professional services.

- pnpm/turbo monorepo: apps/web, packages/{shared,db}
- Postgres 16 + PostGIS via docker compose (ports 5442/6389 to avoid
  clashing with other local stacks)
- Drizzle schema, 23 tables, geography(Point,4326) with GiST indexes
- Domain core in packages/shared: integer-cent money, status transition
  graphs, deck ranking weights, cancellation policy — 46 unit tests
- Deck query: filtering in Postgres on the GiST index, ranking in JS so
  the weights stay tunable — 18 integration tests against a seeded DB
- Deterministic seed placing pros at known distances, including three
  that must NOT appear on a deck (out of radius, unverified, away)
- Next.js 15 app shell with a working swipe deck
- CI: typecheck, lint, test, build against live postgres+redis

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

apps/web/src/app/deck/[jobId]/page.tsx

@@ -0,0 +1,44 @@
+import { eq } from 'drizzle-orm';
+import { notFound } from 'next/navigation';
+import Link from 'next/link';
+import { ArrowLeft } from 'lucide-react';
+import { db, getDeck, schema } from '@linkder/db';
+import { DeckClient } from './deck-client';
+
+export const dynamic = 'force-dynamic';
+
+export default async function DeckPage({ params }: { params: Promise<{ jobId: string }> }) {
+  const { jobId } = await params;
+
+  const job = await db.query.jobs.findFirst({
+    where: eq(schema.jobs.id, jobId),
+    with: { category: true },
+  });
+  if (!job) notFound();
+
+  const cards = await getDeck(db, { jobId });
+
+  return (
+    <main className="mx-auto flex min-h-dvh max-w-2xl flex-col px-4 py-6">
+      <header className="mb-6">
+        <Link
+          href="/"
+          className="mb-4 inline-flex items-center gap-1.5 text-sm text-[var(--muted)] hover:text-[var(--fg)]"
+        >
+          <ArrowLeft className="h-4 w-4" aria-hidden />
+          Back
+        </Link>
+        <p className="text-sm text-[var(--muted)]">
+          {job.category.name} · {job.addressText}
+        </p>
+        <h1 className="text-xl font-semibold">{job.title}</h1>
+      </header>
+
+      <DeckClient jobId={jobId} cards={cards} />
+
+      <p className="mt-8 text-center text-xs text-[var(--muted)]">
+        Swipe right to send this job to a pro, left to pass. Drag the card or use the buttons.
+      </p>
+    </main>
+  );
+}