chore: remover código morto e artefatos, adicionar CI e script typecheck

- componentes sem nenhuma importação (card, items, DeleteButton, IdInput,
  NutriScoreBadge, NutritionBar, NutritionChart, PageTitle, PersuasiveCTA,
  landing/SearchBar), imports e variável não usados (avisos do lint)
- sw.js na raiz: não é referenciado e carrega script de terceiros
  (fenoofaussut.net)
- bun.lock (o deploy e o README usam pnpm), graphify-out/ e os bancos
  SQLite versionados em prisma/prisma (pnpm db:push recria o banco)
- devDependency depcheck sem uso
- .gitignore: *.sqlite, *.sqlite-journal, graphify-out/
- script typecheck e workflow do GitHub Actions (lint, typecheck, test, build)

.github/workflows/ci.yml

@@ -0,0 +1,29 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    env:
+      DATABASE_URL: file:./prisma/db/database.sqlite
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 10
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+      - run: pnpm install --frozen-lockfile
+      - run: pnpm lint
+      - run: pnpm typecheck
+      - run: pnpm test
+      - run: pnpm build