Preserve text_link URLs during translation and move Telegram provider to SpaceGram settings

[Rocket-Space]

Motivation

• Fix loss of clickable links when translating messages: translated text replaced linked spans with plain text, so links lost their URL/entities and stopped working.
• Keep the in-chat provider picker focused on external translation providers and expose the Telegram option only in SpaceGram settings for clarity.

Description

• Added link masking before translation and placeholder restoration after translation in TranslationHelper.translateInline, preserving text_url/url entities and rebuilding TL_textWithEntities with clickable entities (new helper classes LinkPlaceholder and LinkMaskedText, plus maskLinks/restorePlaceholders).
• Updated SpaceGramTranslator to treat provider id 0 as Telegram and added getAllProviderNamesWithTelegram/getAllProviderIdsWithTelegram to expose provider lists that include Telegram only for settings.
• Adjusted SpaceGramGeneralSettingsActivity to use the provider lists that include Telegram so it remains selectable in SpaceGram settings.
• Removed the Telegram option from the in-chat translate provider picker in TranslateButton and simplified the provider subtext logic to use SpaceGramTranslator.getProviderName.

Testing

• Attempted to compile the Android module with ./gradlew :TMessagesProj:compileDebugJavaWithJavac -x lint, but the build failed in this environment with Unsupported class file major version 69 before module compilation completed, so a full compile/test could not be run here.
• Verified via static inspection that modified areas reference the new helpers and that provider lists are routed correctly; changes were committed locally.

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Codex Task

[chatgpt-codex-connector]

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