chore: upgrade AGP version to 8.1.0

[LucasXu0]

Feature Preview

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

Summary by Sourcery

Update Android build tooling and configuration by upgrading AGP and Gradle versions, raising compileSdk levels, and aligning Java/Kotlin compilation settings alongside adding module namespaces.

Enhancements:

• Increase Android compileSdkVersion to 35 for the app module
• Add Java 1.8 source/target compatibility and set Kotlin JVM target to 1.8 in backend module
• Declare explicit Android namespaces for backend and flowy_infra_ui modules

Build:

• Upgrade Android Gradle Plugin to 8.1.0 across relevant modules
• Update Gradle wrapper distribution to Gradle 8.1

[sourcery-ai]

Reviewer's Guide

This PR upgrades the Android Gradle Plugin to 8.1.0 and Gradle wrapper to 8.1, bumps compileSdk levels, and adds required namespace and compile option configurations to support the updated toolchain across multiple Android modules.

Class diagram for updated Android module build configurations

classDiagram
    class AppModule {
        +compileSdkVersion: 35
        +ndkVersion: "24.0.8215888"
    }
    class BackendModule {
        +compileSdkVersion: 33
        +namespace: 'com.plugin.appflowy_backend'
        +compileOptions: Java 1.8
        +kotlinOptions: JVM 1.8
    }
    class InfraUIModule {
        +compileSdkVersion: 33
        +namespace: 'com.example.flowy_infra_ui'
    }
    AppModule <|-- BackendModule
    AppModule <|-- InfraUIModule

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File-Level Changes

Change	Details	Files
Bump Android Gradle Plugin version	Upgraded AGP classpath from 7.4.2 to 8.1.0	frontend/appflowy_flutter/packages/appflowy_backend/android/build.gradle frontend/appflowy_flutter/android/build.gradle
Update Gradle wrapper distribution	Switched Gradle wrapper from 7.5 to 8.1-all distribution	frontend/appflowy_flutter/android/gradle/wrapper/gradle-wrapper.properties
Increase compileSdkVersion	Raised compileSdk from 34 to 35 in the app module	frontend/appflowy_flutter/android/app/build.gradle
Configure namespace and Java/Kotlin compile options	Added Android namespace to backend and infra UI modules Set sourceCompatibility and targetCompatibility to Java 1.8 Set Kotlin jvmTarget to 1.8	frontend/appflowy_flutter/packages/appflowy_backend/android/build.gradle frontend/appflowy_flutter/packages/flowy_infra_ui/android/build.gradle

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[sourcery-ai]

Hey @LucasXu0 - I've reviewed your changes - here's some feedback:

• AGP 8.1 requires JDK 11+, please ensure your local and CI environments are using Java 11 to avoid build failures.
• The flowy_infra_ui module adds compileOptions but is missing a kotlinOptions jvmTarget block—add it to keep the Kotlin JVM target consistent across modules.
• Double-check that the namespaces ('com.plugin.appflowy_backend' and 'com.example.flowy_infra_ui') correctly match your package structure to prevent resource/R-class conflicts.

Prompt for AI Agents

Please address the comments from this code review:
## Overall Comments
- AGP 8.1 requires JDK 11+, please ensure your local and CI environments are using Java 11 to avoid build failures.
- The flowy_infra_ui module adds compileOptions but is missing a kotlinOptions jvmTarget block—add it to keep the Kotlin JVM target consistent across modules.
- Double-check that the namespaces ('com.plugin.appflowy_backend' and 'com.example.flowy_infra_ui') correctly match your package structure to prevent resource/R-class conflicts.

## Individual Comments

### Comment 1
<location> `frontend/appflowy_flutter/android/gradle/wrapper/gradle-wrapper.properties:3` </location>
<code_context>
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.1-all.zip
 networkTimeout=10000
 validateDistributionUrl=true
</code_context>

<issue_to_address>
Switching to gradle-8.1-all.zip increases distribution size.

The '-all' distribution includes sources and docs. If you don't need these, use '-bin' to minimize download size.
</issue_to_address>

<suggested_fix>
<<<<<<< SEARCH
distributionUrl=https\://services.gradle.org/distributions/gradle-8.1-all.zip
=======
distributionUrl=https\://services.gradle.org/distributions/gradle-8.1-bin.zip
>>>>>>> REPLACE

</suggested_fix>

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[sourcery-ai]

suggestion (performance): Switching to gradle-8.1-all.zip increases distribution size.

The '-all' distribution includes sources and docs. If you don't need these, use '-bin' to minimize download size.

Suggested change

	distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-bin.zip
	distributionUrl=https\://services.gradle.org/distributions/gradle-8.1-bin.zip