refactor: Extract duplicate Kscien fetching logic into shared utility module (fixes #11) (#88)

Consolidates duplicated code between kscien_predatory_conferences.py and kscien_generic.py
by creating a shared kscien_helpers.py utility module. This eliminates ~300 lines of
duplicate pagination, HTML parsing, and deduplication logic.

Changes:
- Add kscien_helpers.py with fetch_kscien_data(), deduplicate_entries() functions
- Remove kscien_predatory_conferences.py (replaced by KscienGenericSource)
- Refactor kscien_generic.py to use shared utilities
- Update source registration to use KscienGenericSource for predatory conferences
- Add comprehensive unit tests for refactored functionality

This refactoring improves maintainability, reduces code duplication, and aligns with
DRY principles while preserving all existing functionality.

Co-authored-by: florath-ai-assistant[bot] <Andreas.Florath@telekom.de>

Author: coding-ai-assistant[bot]

src/aletheia_probe/updater/__init__.py

@@ -10,8 +10,8 @@
     AlgerianMinistrySource,
     BeallsListSource,
     CustomListSource,
+    KscienGenericSource,
     KscienHijackedJournalsSource,
-    KscienPredatoryConferencesSource,
     KscienPublishersSource,
     KscienStandaloneJournalsSource,
     PredatoryJournalsSource,
@@ -36,7 +36,7 @@
 data_updater.add_source(BeallsListSource())
 data_updater.add_source(AlgerianMinistrySource())
 data_updater.add_source(PredatoryJournalsSource())
-data_updater.add_source(KscienPredatoryConferencesSource())
+data_updater.add_source(KscienGenericSource(publication_type="predatory-conferences"))
 data_updater.add_source(KscienStandaloneJournalsSource())
 data_updater.add_source(KscienHijackedJournalsSource())
 data_updater.add_source(KscienPublishersSource())
@@ -52,8 +52,8 @@
     "AlgerianMinistrySource",
     "BeallsListSource",
     "CustomListSource",
+    "KscienGenericSource",
     "KscienHijackedJournalsSource",
-    "KscienPredatoryConferencesSource",
     "KscienPublishersSource",
     "KscienStandaloneJournalsSource",
     "PredatoryJournalsSource",

src/aletheia_probe/updater/sources/__init__.py

@@ -4,8 +4,8 @@
 from .algerian import AlgerianMinistrySource
 from .bealls import BeallsListSource
 from .custom import CustomListSource
+from .kscien_generic import KscienGenericSource
 from .kscien_hijacked_journals import KscienHijackedJournalsSource
-from .kscien_predatory_conferences import KscienPredatoryConferencesSource
 from .kscien_publishers import KscienPublishersSource
 from .kscien_standalone_journals import KscienStandaloneJournalsSource
 from .predatoryjournals import PredatoryJournalsSource
@@ -17,8 +17,8 @@
     "AlgerianMinistrySource",
     "BeallsListSource",
     "CustomListSource",
+    "KscienGenericSource",
     "KscienHijackedJournalsSource",
-    "KscienPredatoryConferencesSource",
     "KscienPublishersSource",
     "KscienStandaloneJournalsSource",
     "PredatoryJournalsSource",