[3.x] Remove check for deprecated Laravel Mix command flags

[emmadesilva]

Removed the checkForDeprecatedRunMixCommandUsage helper and deprecated --run-dev/--run-prod options

These Mix-era options were deprecated in v2.0 and are being fully removed for v3. The --vite flag supersedes them.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d4328f1) to head (e4e2553).

Additional details and impacted files

@@ Coverage Diff @@## v3-dev #2461 +/- ##
===========================================
Coverage 100.00% 100.00% Complexity 2007 2007 ===========================================
Files 197 197 Lines 5145 5144 -1 ===========================================
- Hits 5145 5144 -1 

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[Copilot]

Pull request overview

This PR finalizes the v3 removal of legacy Laravel Mix-era flags for the build console command by deleting the placeholder options and the helper that emitted a custom deprecation/error message, aligning the CLI surface area around --vite.

Changes:

• Removed --run-dev / --run-prod options from the build command signature.
• Removed the checkForDeprecatedRunMixCommandUsage() helper and its invocation.
• Documented the cleanup in the HydePHP v3 planning document.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/framework/src/Console/Commands/BuildSiteCommand.php	Removes deprecated Mix-era CLI options and the legacy deprecation handler from the build command.
HYDEPHP_V3_PLANNING.md	Notes the removal as part of v3 minor cleanup/planning.

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