chore: convert to Turborepo + npm workspaces monorepo

- Move React/Vite frontend to apps/web/ (@budgetwise/web)
- Add apps/appwrite/ (@budgetwise/appwrite) to source-control the
  Appwrite backend: declarative schema in appwrite.json (5 collections),
  CLI-based deploy.sh for containerized use, functions/ dir for future
  Appwrite Functions
- Add turbo.json for task orchestration (build, deploy, dev)
- Replace .gitlab-ci.yml with Woodpecker CI pipelines in .woodpecker/:
    web-production.yml  — push to main → build + rsync to prod
    web-staging.yml     — push to staging → build + rsync to staging
    web-preview.yml     — PR open → deploy to {pr}.{domain}; PR close → cleanup
    appwrite.yml        — schema changes in apps/appwrite/ → CLI deploy
- All secrets injected via Woodpecker CI (no committed .env files)

.gitignore

@@ -1,12 +1,29 @@
+# Dependencies
 node_modules
-dist
-dist-ssr
-*.local
+
+# Turbo cache
+.turbo
+
+# Build outputs
+apps/web/dist
+apps/web/dist-ssr
+
+# Local env files — never commit
 .env
 .env.local
 .env.production
 .env.staging
 .env.preview
+apps/**/.env
+apps/**/.env.local
+apps/**/.env.production
+apps/**/.env.staging
+apps/**/.env.preview
+
+# OS
 .DS_Store
 *.pem
+
+# Coverage
 coverage
+*.local