fix(v2): strip ANSI escape sequences and use LC_ALL=C in apt PackageInstalled

[leaanthony]

Problem

wails doctor incorrectly reports libgtk-3-dev and libwebkit2gtk-4.0-dev as not installed on some Debian/Ubuntu systems where apt list -qq output includes ANSI escape codes or the locale is non-English.

Closes #4258

Changes

• Strip ANSI escape sequences from apt list output in PackageInstalled (using the existing removeEscapeSequences method already used by PackageAvailable)
• Replace LANGUAGE=en with LC_ALL=C for more robust locale forcing

Testing

• Verified the removeEscapeSequences regex correctly strips ANSI codes from colored apt output
• The strings.Contains check for [installed] already handles all variants: [installed], [installed,local], [installed,automatic], [installed,upgradable to: X.Y.Z]

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