fix: professional profile not loading or saving correctly

- Fix typo aditional_address -> additional_address in toDocument() and fromDocument()
- Clear ProfessionalFormProvider before fetch in initState() so TextFormField initialValue always applies to fresh data
- Add clear() to ProfessionalFormProvider; call it on logout to avoid leaking data between users

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/models/profesional.dart

@@ -132,7 +132,7 @@ class Profesional {
       rethusCode: (doc['rethus_code'] as String?) ?? '',
       rethusValidated: (doc['rethus_validated'] as bool?) ?? false,
       address: (doc['address'] as String?) ?? '',
-      aditionalAddress: (doc['aditional_address'] as String?) ?? '',
+      aditionalAddress: (doc['additional_address'] as String?) ?? '',
       profession: (doc['profession'] as String?) ?? '',
       ratePreferences: (doc['rate_preferences'] as bool?) ?? false,
       rate: (doc['rate'] as num?)?.toString() ?? '',
@@ -202,7 +202,7 @@ class Profesional {
       'rethus_code': rethusCode,
       'rethus_validated': rethusValidated,
       'address': address,
-      'aditional_address': aditionalAddress,
+      'additional_address': aditionalAddress,
       'profession': profession,
       'rate_preferences': ratePreferences,
       'rate': double.tryParse(rate) ?? 0.0,