fix(ios): include the Obj-C shim in the podspec source_files

[bohdanvela]

Problem

The Obj-C shim added in 11.0.2 is never compiled under CocoaPods, so 11.0.2 still fails exactly like 11.0.1 for non-SPM apps (#395, #396):

Semantic Issue (Xcode): Unknown receiver 'FlutterForegroundTaskPlugin';
did you mean 'SwiftFlutterForegroundTaskPlugin'?
ios/Runner/GeneratedPluginRegistrant.m

Cause

Both globs in source_files are resolved relative to the podspec's directory (ios/). The Swift glob carries the flutter_foreground_task/ prefix, but the Obj-C one does not:

s.source_files = 'flutter_foreground_task/Sources/flutter_foreground_task/**/*.swift',
                 'Classes/**/*.{h,m}'

So CocoaPods looks for ios/Classes/, while the files actually live in ios/flutter_foreground_task/Classes/. The glob matches nothing, the shim is silently dropped from the pod, and FlutterForegroundTaskPlugin never exists for the generated registrant — the class is otherwise only declared in FlutterForegroundTaskPluginSPMBridge.swift behind #if SWIFT_PACKAGE, which is not defined for CocoaPods builds.

Fix

Add the missing prefix so the shim is part of the pod.

Verification

Built a real CocoaPods (non-SPM) app against this repo, wiping Pods/ and build/ before each run and changing only this glob:

source_files Obj-C glob	Result	FlutterForegroundTaskPlugin.m refs in generated Pods.xcodeproj
'Classes/**/*.{h,m}' (11.0.2 as published)	❌ Unknown receiver 'FlutterForegroundTaskPlugin'	0
'flutter_foreground_task/Classes/**/*.{h,m}' (this PR)	✅ builds and links	4

Environment: Flutter 3.47.2, CocoaPods 1.16.2, Xcode iOS device release build, SPM disabled (flutter config --no-enable-swift-package-manager).

Closes #395
Closes #396

[bohdanvela]

@Dev-hwang please take a look, it should fix these issues
#396
#395

[bohdanvela]

I had the same problem and when I tried to clean the cache, the error persisted