chore: add root .npmrc for consistent workspace dependency hoisting

[broBinChen]

Problem Description

When running pnpm install from the root directory, the dependency hoisting strategy may be inconsistent with subdirectory configurations, causing module resolution issues (e.g., dayjs import errors).
fixed: #70

Solution

Add .npmrc file at the root level to unify pnpm configuration across the entire workspace:

• shamefully-hoist=true: Ensures dependencies are hoisted to the node_modules root directory, compatible with Nuxt/Vite module resolution mechanism
• strict-peer-dependencies=false: Allows flexible peer dependency resolution to avoid installation failures

Impact

• ✅ Ensures pnpm install works correctly when executed from the root directory
• ✅ Unifies dependency hoisting strategy across the entire workspace
• ✅ Maintains consistency with existing apps/www/.npmrc configuration

[snowbitx]

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