refactor: Move darwin native sources into a canonical Sources/ tree

[NandanPrabhu]

📋 Changes

Extracted from #804. Relocates auth0_flutter/darwin/Classes/*.swift into auth0_flutter/darwin/auth0_flutter/Sources/auth0_flutter/, turning the old Classes/ location — and the ios//macos/ CocoaPods directories — into symlinks generated by scripts/generate-symlinks.sh. This gives CocoaPods (and a future SPM target) a single canonical source location instead of duplicated/symlinked per-platform trees.

Also renames SwiftAuth0FlutterPlugin → Auth0FlutterPlugin and drops the Objective-C shim (Auth0FlutterPlugin.h/.m), since the class name can now match the pluginClass declared in pubspec.yaml directly without an ObjC bridge.

This is a pure move + rename, no behavior change for CocoaPods consumers:

• Every relocated file is byte-identical to its previous location (verified file-by-file against main).
• darwin/auth0_flutter.podspec's source_files is updated to point at the new path; ios/ and macos/ podspecs are unchanged (they still glob Classes/**/*, which is now populated by regenerated symlinks).
• scripts/generate-symlinks.sh is updated to generate darwin/Classes/<rel> -> ../../auth0_flutter/Sources/auth0_flutter/<rel> and ios|macos/Classes/<rel> -> ../../../darwin/Classes/<rel>, verifying every symlink resolves. Confirmed idempotent (re-running the script against its own output produces no diff), so the existing Symlinks CI job continues to pass.

No Dart files, pubspec.yaml, or CI workflows are touched.

📎 References

• Precursor to feat: Swift Package Manager dependency support for Flutter iOS/macOS SDK #804 (SPM support), which will rebase onto this once merged.

🎯 Testing

• Verified every file moved from darwin/Classes/ is byte-identical to its main counterpart (2 intentional exceptions: the plugin class rename and dropping the ObjC shim).
• pod ipc spec auth0_flutter/darwin/auth0_flutter.podspec validates the podspec and resolves source_files to the 64 real Swift files under the new Sources/ path.
• Re-ran scripts/generate-symlinks.sh after committing; zero diff, confirming CI's Symlinks check will pass.
• plutil -lint on the updated example iOS project.pbxproj after the test-file rename.

🤖 Generated with Claude Code

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[NandanPrabhu]

Closing and reopening as a fresh PR to keep this cascading pair's PR numbers/descriptions in sync (see the SPM PR it now precedes: #893).