fix(therapist): Remove unused and duplicate imports across therapist app

## Summary

Running `flutter analyze` on the `therapist/` app reveals **14 unused import warnings** across 9 files. These are `warning`-level diagnostics.

## Affected Files

| File | Issue |
|------|-------|
| `lib/core/repository/therapist/therapist_repository.dart` | `unused_import`: `profession_model.dart` |
| `lib/presentation/auth/auth_screen.dart` | `unused_import`: `personal_details_screen.dart`, `home_screen.dart` |
| `lib/presentation/consultation/consultation_request_detail_screen.dart` | `unused_import`: `provider.dart`, `consultation_request_entity.dart`, `consultation_provider.dart` |
| `lib/presentation/home/widgets/patient_card.dart` | `unused_import`: `therapy_goals_screen.dart` |
| `lib/presentation/therapy_goals/therapy_home_screen.dart` | `unused_import`: `provider.dart`, `supabase_therapy_repository.dart`, `therapy_repository.dart`, `daily_activities_provider.dart` |
| `lib/provider/consultation_provider.dart` | `unused_import`: `consultation_request_entity.dart` |
| `lib/provider/therapist_provider.dart` | `unused_import`: `therapist_personal_info_entity.dart` |
| `lib/repository/supabase_therapy_repository.dart` | `unused_import`: `dart:convert`, `flutter/foundation.dart`, `daily_activity_model.dart`, `daily_activity_response_model.dart` |

## Steps to Reproduce

```
cd therapist
flutter analyze
```

## Expected Behavior

`flutter analyze` reports no `unused_import` warnings.

## Fix

Remove each flagged import line.