fix: resolve nodriver 0.47+ RemoteObject compatibility issues (#645)

## ℹ️ Description
*Provide a concise summary of the changes introduced in this pull
request.*

- Link to the related issue(s): #644
- Describe the motivation and context for this change.

This PR resolves compatibility issues with nodriver 0.47+ where
page.evaluate() returns RemoteObject instances that need special
handling for proper conversion to Python objects. The update introduced
breaking changes in how JavaScript evaluation results are returned,
causing TypeError: [RemoteObject] object is not subscriptable errors.

## 📋 Changes Summary

- Fixed TypeError: [RemoteObject] object is not subscriptable in
web_request() method
- Added comprehensive RemoteObject conversion logic with
_convert_remote_object_result()
- Added _convert_remote_object_dict() for recursive nested structure
conversion
- Fixed price field concatenation issue in MODIFY mode by explicit field
clearing
- Updated web_sleep() to accept integer milliseconds instead of float
seconds
- Updated German translations for new log messages
- Fixed linting issues (E711, E712) in test assertions

### ⚙️ Type of Change
Select the type(s) of change(s) included in this pull request:
- [x] 🐞 Bug fix (non-breaking change which fixes an issue)
- [ ] ✨ New feature (adds new functionality without breaking existing
usage)
- [ ] 💥 Breaking change (changes that might break existing user setups,
scripts, or configurations)

## ✅ Checklist
Before requesting a review, confirm the following:
- [x] I have reviewed my changes to ensure they meet the project's
standards.
- [x] I have tested my changes and ensured that all tests pass (pdm run
test).
- [x] I have formatted the code (pdm run format).
- [x] I have verified that linting passes (pdm run lint).
- [x] I have updated documentation where necessary.

By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice.

src/kleinanzeigen_bot/resources/translations.de.yaml

@@ -391,7 +391,7 @@ kleinanzeigen_bot/utils/web_scraping_mixin.py:
     "4. Check browser binary permissions: %s": "4. Überprüfen Sie die Browser-Binärdatei-Berechtigungen: %s"
     "4. Check if any antivirus or security software is blocking the connection": "4. Überprüfen Sie, ob Antiviren- oder Sicherheitssoftware die Verbindung blockiert"
 
-  web_execute:
+  _convert_remote_object_result:
     "Failed to convert RemoteObject to dict: %s": "Fehler beim Konvertieren von RemoteObject zu dict: %s"
 
   web_check: