Update build configuration for Chaquopy

Update app/build.gradle:
- Add Chaquopy Gradle plugin
- Configure Python 3.10 with pip dependencies
- Add custom Gradle tasks for Kolibri tar patching
- Update signing and build type configuration
- Add Spotless for Java code formatting

Update Java classes with new package declarations:
- Utility classes now in org.learningequality.Kolibri.util
- Worker classes now in org.learningequality.Kolibri.workers
- Notification classes now in org.learningequality.Kolibri.notification
- Task classes now in org.learningequality.Kolibri.task

Update Python files for Chaquopy integration

Update build files:
- .gitignore: Add Chaquopy-specific patterns
- Makefile: Update build targets for Gradle
- requirements.txt: Update Python dependencies
- build-requirements.txt: Add build-time dependencies
- scripts/create_strings.py: Update for new resource paths
- scripts/version.py: Update version calculation
- .pre-commit-config.yaml: Update hooks
- README.md: Update documentation

Part of #197: Migrate App to use Chaquopy

Author: rtibbles

.gitignore

@@ -1,44 +1,45 @@
-# A generated source file
-src/strings.py
+# Generated source files
+app/src/main/python/strings.py
+app/src/main/res/*/html_content.xml
+app/src/main/res/values-*/strings.xml
+
+# Temporary files
 tmpenv
-tar
-python-for-android/build/
-python-for-android/packages/**
-python-for-android/dists/kolibri/_python*
-python-for-android/dists/kolibri/.gradle
-python-for-android/dists/kolibri/build
-python-for-android/dists/kolibri/gradle/*
-python-for-android/dists/kolibri/jni
-python-for-android/dists/kolibri/libs
-python-for-android/dists/kolibri/templates
-python-for-android/dists/kolibri/obj
-python-for-android/dists/kolibri/src/res_initial
-python-for-android/dists/kolibri/src/main/assets/private.tar
-python-for-android/dists/kolibri/webview_includes
-python-for-android/dists/kolibri/*.*
-python-for-android/dists/kolibri/gradlew
-python-for-android/dists/kolibri/src/main/res/*/html_content.xml
-python-for-android/dists/kolibri/src/main/res/values-*/strings.xml
-!python-for-android/dists/kolibri/build.gradle
-!python-for-android/dists/kolibri/gradle.properties
-
-# File format for signing key
+tmphome/
+
+# Kolibri tar files and patches
+tar/
+tar/patched/
+
+# File format for signing keys
 *.jks
+*.keystore
 
-# output folder
+# Output folder
 dist/
 
+# Python
 __pycache__
 *.pyc
-build_docker
-bin/
-build.log
-tmphome/
-android_root/
 
+# Android build artifacts
+android_root/
 *.apk
+bin/
+build/
+.gradle/
+.cxx
+.externalNativeBuild
+captures/
+local.properties
+
+# IDE
+.idea/
+*.iml
+.DS_Store
+
+# Environment
 .env
-.version-code
-*.keystore
 .envrc
-.idea/
+build_docker
+build.log

.pre-commit-config.yaml

@@ -21,3 +21,12 @@ repos:
         rev: v2.6.0
         hooks:
             -   id: reorder-python-imports
+
+    -   repo: local
+        hooks:
+            -   id: spotless
+                name: spotless (Java/Gradle formatting)
+                entry: ./gradlew spotlessCheck --no-daemon
+                language: system
+                pass_filenames: false
+                files: \.(java|gradle)$