feat(fusion_accounting_followup): Phase 4 skeleton + plan

35-task plan to replace Enterprise account_followup module:
- Multi-level dunning (gentle reminder -> firm warning -> legal)
- AI augmentation: contextual follow-up text generation + payment risk scoring + tone selection
- HYBRID engine: shared primitives + persisted level/run/cache models
- Per-partner state: current level, paused-until, history
- Coexists with Enterprise (group_fusion_show_when_enterprise_absent)
- Same V19 conventions + test pyramid + perf-budget discipline as Phases 1-3

Made-with: Cursor

fusion_accounting_followup/__manifest__.py

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+{
+    'name': 'Fusion Accounting Follow-up',
+    'version': '19.0.1.0.0',
+    'category': 'Accounting/Accounting',
+    'summary': 'AI-augmented customer follow-ups (dunning) for unpaid invoices.',
+    'description': """
+Fusion Accounting Follow-up
+===========================
+
+A Fusion-native replacement for Odoo Enterprise's account_followup module.
+
+CORE scope (Phase 4):
+- Multi-level dunning sequences (gentle reminder, firm warning, legal)
+- Per-partner follow-up state (current level, paused-until, history)
+- Automated daily scan + escalation cron
+- Mail templates per level
+
+AI augmentation:
+- Contextually-appropriate follow-up text generation (LLM)
+- Payment-risk scoring from invoice/payment history
+- Tone selection (gentle/firm/legal) based on level + risk
+
+Coexists with Enterprise: when account_followup is installed, the Fusion
+menu hides; the engine + AI tools remain available for the chat.
+""",
+    'author': 'Fusion Accounting',
+    'license': 'LGPL-3',
+    'depends': [
+        'fusion_accounting_core',
+        'fusion_accounting_ai',
+        'account',
+        'mail',
+    ],
+    'data': [
+        'security/ir.model.access.csv',
+    ],
+    'assets': {
+        'web.assets_backend': [
+        ],
+    },
+    'installable': True,
+    'auto_install': False,
+    'application': False,
+    'icon': '/fusion_accounting_followup/static/description/icon.png',
+}

fusion_accounting_followup/security/ir.model.access.csv

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+id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink