Harden release demo controls and language labels

[Pigbibi]

Summary

• force release builds away from mock/demo data and non-prod environments
• hide demo/network controls when runtime debug options are unavailable
• localize the top bar back action and remove negative letter spacing
• share language option labels and rename zh-HK to Hong Kong/Macau

Verification

• git diff --check
• static search for negative letter spacing and hard-coded Back content description

Note: Android unit tests could not run here because ANDROID_HOME / Android SDK is not configured.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Add the imports for the localized back label

Changing the literal to stringResource(R.string.back) leaves this file without either androidx.compose.ui.res.stringResource or cn.gdeiassistant.R in its imports, so any build that compiles AppTopBar fails with unresolved references instead of producing the localized content description.

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