Version up libraries to match nowinandroid

[dadachi]

Summary

• Upgrade major dependencies to match nowinandroid: AGP 9.0.0, Kotlin 2.3.0, Gradle 9.1.0, Compose BOM 2025.09.01, Hilt 2.59, and others
• Extract proto files into dedicated :datastore-proto module (matching nowinandroid project structure)
• Migrate MenuAnchorType → ExposedDropdownMenuAnchorType for Material3 Compose BOM compatibility
• Update Kotlin compiler options from deprecated kotlinOptions to compilerOptions block

Test plan

• Verify ./gradlew assembleDebug builds successfully
• Verify ./gradlew test passes
• Verify all dropdown menus render correctly (affected by Material3 API change)

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