fix: add GOPROXY=direct to xportal build commands

[pcfreak30]

This pull request modifies the build-portal.sh script to ensure xportal build commands fetch Go modules directly from source rather than through the Go module proxy.

Key Changes:

1. Added GOPROXY=direct environment variable: Introduced a run_xportal() helper function that sets GOPROXY=direct when executing xportal build. This forces Go to bypass the module proxy cache and fetch dependencies directly from their source repositories (e.g., GitHub), ensuring the latest versions are used and avoiding potential stale cache issues.

2. Refactored build logic: Consolidated the previously duplicated xportal build invocation patterns (handling optional output directories and plugin arguments) into a single call through the run_xportal helper. This eliminates repetitive environment variable exports and reduces code duplication while maintaining the same functionality for building with or without plugins and custom output paths.

Functional Impact:

• Resolves potential build failures or outdated dependency issues caused by cached module proxies
• Simplifies maintenance by centralizing the xportal execution configuration
• No breaking changes to the build output or command-line interface behavior

[kody-ai]

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