fix(railway): add .npmrc with legacy-peer-deps to fix Nixpacks build conflict

[Anton-dev3306]

Description

This PR fixes the Railway build failure caused by a peer dependency conflict between [email protected] and @livechat/[email protected], which requires react@^16.3.0.

Nixpacks runs npm install during the Railway build without the --legacy-peer-deps flag, causing an ERESOLVE error. The project already uses --legacy-peer-deps in its install:all script, but Nixpacks does not pick that up automatically.

Adding a .npmrc file at the monorepo root with legacy-peer-deps=true makes the flag available at the build level regardless of which command Railway runs.

Changes

• Added .npmrc at monorepo root: Sets legacy-peer-deps=true to resolve the Nixpacks peer dependency conflict during Railway builds.

Verification

• This fix is consistent with Railway's own build diagnosis suggestion.
• The existing --legacy-peer-deps flag in install:all confirms this is the intended approach for this project.

Related Issue

Related to the Railway build failures observed in #328 and previous deploys.

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