feat(fusion_accounting_followup): AI follow-up text generator + prompt

Made-with: Cursor

fusion_accounting_followup/services/__init__.py

@@ -2,3 +2,5 @@ from . import overdue_aging
 from . import level_resolver
 from . import risk_scorer
 from . import tone_selector
+from . import followup_text_prompt
+from . import followup_text_generator