Add web.config for Azure App Service IIS deployment

[Copilot]

PR #57 deployed React build artifacts to Azure App Service but failed during ZIP deployment. Azure App Service runs IIS, which requires a web.config file to serve SPAs correctly.

Changes

• Added frontend/app/public/web.config: IIS configuration with URL rewrite rules
  • Rewrites all non-file requests to index.html for client-side routing
  • Excludes /.auth/* paths to preserve Azure App Service authentication endpoints
  • Configures MIME types for .json, .woff, .woff2
  • Uses DetailedLocalOnly error mode to prevent information disclosure

The file is automatically copied to build/ during npm run build and deployed with the application.

<rule name="React Routes" stopProcessing="true">
  <match url=".*" />
  <conditions logicalGrouping="MatchAll">
    <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
    <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
    <add input="{REQUEST_URI}" pattern="^/(\.auth)" negate="true" />
  </conditions>
  <action type="Rewrite" url="/" />
</rule>

Fixes #56

Original prompt

#56 is not solved as #57 failed. Have a look and solve

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[fpittelo]

ok