fix(build): unblock nightly packaging

[AAswordman]

Summary

• disable MNN LLM command-line demos from the Android native build
• remove translations whose default memory_space_* resources no longer exist

Issue

N/A - fixes local Nightly packaging blockers.

Compatibility and data

• No application runtime API, data schema, or user-visible behavior changes.
• The MNN command-line demos are not packaged by the app.

Validation

• :app:assembleNightly succeeded locally.
• Nightly APK V2/V3 signatures verified.
• XML resource parsing and git diff --check passed.