fix: complete SPM migration — runtime crash fixes, use arrrrny/google-mlkit-swiftpm 9.0.0-1

[arrrrny]

Description

This PR builds on the SPM migration in feature/spm and adds critical runtime fixes that were discovered after the original PR (#874) was merged and reverted.

What's Fixed

Runtime Crashes Resolved

1. MLKTextRecognizerInternalErrorCreationFailure: Invalid model path — ML Kit Text Recognition model bundles weren't being found in SPM static-link builds. Fixed by switching to arrrrny/google-mlkit-swiftpm release 9.0.0-1 which properly packages resource bundles.

2. [MLKITx_GMVUtility grayPixelData:...] unrecognized selector sent to class — ObjC category methods not loaded. Fixed by adding -ObjC and -all_load linker flags to all plugin targets.

3. dyld flat-namespace crash on TestFlight/Release builds — Resolved by ensuring proper Mach-O linking for ML Kit static frameworks.

Changes Included

• All 11 Package.swift files updated to reference arrrrny/google-mlkit-swiftpm (with revision pinning to the fixed commit)
• Removed all 22 CocoaPods podspecs — pure SPM
• Added -ObjC + -all_load linker flags in xcconfig files for all plugin targets
• Per-language OCR resource bundles (Latin, Chinese, Japanese, Korean, Devanagari) properly embedded
• Build phase scripts for MLKitTextRecognitionCommon dylib replacement with model data
• Focused text_recognition_example app that validates text recognition end-to-end
• Cleanup: removed CocoaPods artifacts (Podfile, Podfile.lock, Pods/), stale build caches, package.resolved files for library targets
• Gitignore updated for SPM artifacts

Testing

• Text recognition tested and working on physical iOS device
• Barcode scanning verified working
• Face detection expected to work (needs device testing)
• The main example app runs with camera-based text recognition

Related

• Closes: fix: SPM migration - fix Package.swift product refs, pod deintegrate,… #874 (reverted due to runtime crashes, this PR fixes them)
• Upstream issue: Text recognition crashes: MLKitTextRecognitionCommon model data stripped by SPM d-date/google-mlkit-swiftpm#106
• Fork release: arrrrny/google-mlkit-swiftpm 9.0.0-1

[fbernaly]

review if these files are needed?

Those are not os targets in the project

[fbernaly]

why do we need these?

[fbernaly]

resolve these:

[arrrrny]

Addressing your comments:

1. linux/, macos/, web/, RunnerTests files — You're right, these are NOT needed. They were accidentally included when the example app's iOS configuration was regenerated. They should be removed from the PR. I'll push a cleanup.

2. OCR resource bundle files — These ARE needed. They contain the TFLite model files (.bincfg, .tflite, .class_lst, .conv_model, .lstm_model) that ML Kit's text recognition engine requires at runtime. ML Kit uses [NSBundle mainBundle] to find these .bundle directories — they must be in the app's main bundle via the Xcode project's "Copy Bundle Resources" phase. Without them, text recognition crashes with MLKTextRecognizerInternalErrorCreationFailure: Invalid model path.

3. Merge conflicts — I'll resolve them by rebasing spm-fixed onto the latest feature/spm and removing the unnecessary platform files. Will push an updated branch shortly.

[arrrrny]

✅ Cleaned up — pushed commit ad99da4 to spm-fixed which removes linux/, macos/, web/, RunnerTests, and SceneDelegate files. These were accidentally generated during flutter create and are not needed for the iOS SPM migration.

The remaining new files are:

• OCR resource bundles (.bundle directories with TFLite model files) — required for text recognition
• iOS-specific changes (Package.swift, pbxproj, xcconfig, Package.resolved) — the actual SPM migration

The PR now only contains iOS-relevant changes.