feat: add monorepo configuration and shared packages structure

Root-level setup:
- package.json with Turborepo scripts
- pnpm-workspace.yaml for workspace management
- turbo.json for build pipeline
- Common config files (.nvmrc, .prettierrc, .editorconfig)

Shared packages (packages/):
- @manacore/shared-types - Common TypeScript types
- @manacore/shared-supabase - Unified Supabase client
- @manacore/shared-utils - Date, string, async utilities
- @manacore/shared-ui - React Native UI components (placeholder)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.prettierignore

@@ -0,0 +1,32 @@
+# Dependencies
+node_modules/
+.pnpm-store/
+
+# Build outputs
+dist/
+build/
+.next/
+.nuxt/
+.output/
+.svelte-kit/
+.astro/
+.expo/
+android/
+ios/
+
+# Turbo
+.turbo/
+
+# Package manager
+pnpm-lock.yaml
+package-lock.json
+yarn.lock
+
+# Generated files
+*.min.js
+*.min.css
+coverage/
+
+# IDE
+.idea/
+.vscode/