feat: rootless long-press home button trigger via Shizuku

[T1nG3R]

Adds an option to trigger Circle to Search by long-pressing the Home button on unrooted devices using Shizuku.

Background

Currently, Home button triggering requires LSPosed module hooks in the system framework. Devices running without root can only trigger MiCTS from the Quick Settings tile or third-party shortcut apps.

Implementation

• Shizuku integration: Uses Shizuku to grant WRITE_SECURE_SETTINGS to MiCTS without root or an active computer connection after initial wireless pairing.
• Assistant routing: Directs the assistant secure setting to MainActivity while preserving Google's voice_interaction_service. When invoked by long-pressing Home, MiCTS triggers Circle to Search immediately without delay.
• Reboot handling: Implements a BootReceiver supporting Direct Boot (LOCKED_BOOT_COMPLETED and BOOT_COMPLETED) to track state changes, since Android resets third-party assistant assignments on reboot.
• Settings UI: Adds a toggle under App Settings with status indicators and dialogs for Shizuku status, Google default assistant prerequisites, and the Xiaomi / HyperOS requirement for "USB debugging (Security settings)".
• Documentation: Updates README_en.md and README.md with setup instructions.

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