refactor: SPM Firebase-free TurboModule boundary and Swift/Kotlin helper ports

[mikehardy]

Summary

• Clips the SPM critical-path follow-on: product TurboModule .mm files are Firebase-free via plain ObjC helpers (App Check → Crashlytics → Messaging → Functions → Perf → Analytics → Firestore → Installations → App Distribution), with Auth/DB/RC/Storage already probe-ready.
• Includes substantial Swift/Kotlin helper, registry, and mapper ports already on this branch, plus post-refactor(app): port native App helpers to Swift and Kotlin #9337 rebase and port of main bugfixes into Helpers/Swift/Kotlin (SPM-REBASE-2).
• Remaining deeper language-port work (TurboModule shells / SDK ports) is out of scope for this PR and stays on the Linear backlog for a later batch.

Test plan

• Full-tier e2e slot 7: iOS 1542 / Android 1553 / macOS 1336 passing (pending only)
• Coverage post-process exit 0 (iOS + Android)
• Rebase onto main after refactor(app): port native App helpers to Swift and Kotlin #9337; SPM-REBASE-2 receipts under .agents/reports/SPM-REBASE-2/
• CI green on this PR (promote from draft; merge when checks + review allow)

Notes

• Local full e2e proved the stack at tip 30e32bd3a.
• Do not expect this PR to close the overall Swift/Kotlin migration issue; only the SPM boundary critical path is clipped here.

---

Maintainer note: Related to internal CPRN-487 (SPM critical-path slice only; do not auto-close — language port remains backlog)

[codecov]

Codecov Report

❌ Patch coverage is 97.30435% with 62 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.85%. Comparing base (07e4562) to head (cec875c).
⚠️ Report is 59 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #9355      +/-   ##
============================================
+ Coverage     70.88%   74.85%   +3.97%     
- Complexity     2244     2287      +43     
============================================
  Files           446      624     +178     
  Lines         25532    41128   +15596     
  Branches       4343     5228     +885     
============================================
+ Hits          18097    30781   +12684     
- Misses         6134     8762    +2628     
- Partials       1301     1585     +284     

Flag	Coverage Δ
android-native	70.54% <100.00%> (+1.17%)	⬆️
e2e-ts-android	53.97% <ø> (+0.07%)	⬆️
e2e-ts-ios	53.36% <ø> (?)
e2e-ts-macos	49.84% <ø> (+0.05%)	⬆️
ios-native	78.92% <97.08%> (?)
ios-ruby	100.00% <ø> (?)
jest	50.06% <ø> (ø)

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