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/package.json

@@ -0,0 +1,37 @@
+{
+  "name": "@linkder/web",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "next dev --port 3000",
+    "build": "next build",
+    "start": "next start",
+    "lint": "eslint .",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@linkder/db": "workspace:*",
+    "@linkder/shared": "workspace:*",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "drizzle-orm": "0.38.4",
+    "lucide-react": "^0.469.0",
+    "motion": "^11.15.0",
+    "next": "^15.1.4",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "tailwind-merge": "^2.6.0"
+  },
+  "devDependencies": {
+    "@eslint/eslintrc": "3.2.0",
+    "@tailwindcss/postcss": "^4.0.0",
+    "@types/react": "^19.0.7",
+    "@types/react-dom": "^19.0.3",
+    "dotenv": "16.4.7",
+    "eslint": "^9.18.0",
+    "eslint-config-next": "^15.1.4",
+    "tailwindcss": "^4.0.0",
+    "typescript": "^5.7.3"
+  }
+}