Migrate package identifier from com.example to com.shafisma

[Copilot]

Updates application package identifier from the default com.example namespace to com.shafisma across all platform configurations.

Changes by platform:

• Android: Updated namespace and applicationId in build.gradle.kts, package declaration in MainActivity.kt, and directory structure from com/example/ledger/ to com/shafisma/ledger/
• iOS: Updated PRODUCT_BUNDLE_IDENTIFIER for Runner and RunnerTests across Debug, Release, and Profile configurations
• macOS: Updated PRODUCT_BUNDLE_IDENTIFIER in AppInfo.xcconfig and project.pbxproj, copyright notice
• Linux: Updated APPLICATION_ID in CMakeLists.txt
• Windows: Updated CompanyName and LegalCopyright in Runner.rc

This change ensures the application uses a proper organizational identifier rather than the template default.

Original prompt

change com.example to com.shafisma

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