feat(fusion_accounting_ai): add LLMProvider contract + configurable openai base_url

Phase 1 prerequisite for local LLM support. Adapters now declare
capability flags (supports_tool_calling, max_context_tokens, etc.) so
the engine can reason about what backend is available.

OpenAI adapter accepts fusion_accounting.openai_base_url config -- point
it at LM Studio (http://host.docker.internal:1234/v1) or Ollama
(http://host.docker.internal:11434/v1) and the existing OpenAI adapter
works unchanged.

Implementation note: existing Odoo AbstractModel adapters
(fusion.accounting.adapter.openai/claude) are preserved untouched to
avoid breaking the chat panel; the new plain-Python OpenAIAdapter and
ClaudeAdapter classes (LLMProvider subclasses) are added alongside them.

Made-with: Cursor

fusion_accounting_ai/tests/__init__.py

@@ -1,2 +1,3 @@
 from . import test_post_migration
 from . import test_data_adapters
+from . import test_llm_provider_contract

fusion_accounting_ai/tests/test_llm_provider_contract.py

@@ -0,0 +1,45 @@
+from odoo.tests.common import TransactionCase, tagged
+from odoo.addons.fusion_accounting_ai.services.adapters._base import LLMProvider
+
+
+@tagged('post_install', '-at_install')
+class TestLLMProviderContract(TransactionCase):
+    """Every LLM adapter must satisfy the LLMProvider contract."""
+
+    def test_base_class_defines_capability_attrs(self):
+        self.assertTrue(hasattr(LLMProvider, 'supports_tool_calling'))
+        self.assertTrue(hasattr(LLMProvider, 'supports_streaming'))
+        self.assertTrue(hasattr(LLMProvider, 'max_context_tokens'))
+        self.assertTrue(hasattr(LLMProvider, 'supports_embeddings'))
+
+    def test_openai_adapter_implements_contract(self):
+        from odoo.addons.fusion_accounting_ai.services.adapters.openai_adapter import OpenAIAdapter
+        self.assertTrue(issubclass(OpenAIAdapter, LLMProvider))
+        adapter = OpenAIAdapter(self.env)
+        self.assertIsInstance(adapter.supports_tool_calling, bool)
+        self.assertIsInstance(adapter.max_context_tokens, int)
+
+    def test_claude_adapter_implements_contract(self):
+        from odoo.addons.fusion_accounting_ai.services.adapters.claude import ClaudeAdapter
+        self.assertTrue(issubclass(ClaudeAdapter, LLMProvider))
+        adapter = ClaudeAdapter(self.env)
+        self.assertIsInstance(adapter.supports_tool_calling, bool)
+        self.assertIsInstance(adapter.max_context_tokens, int)
+
+    def test_openai_adapter_uses_configurable_base_url(self):
+        self.env['ir.config_parameter'].sudo().set_param(
+            'fusion_accounting.openai_base_url', 'http://localhost:1234/v1')
+        self.env['ir.config_parameter'].sudo().set_param(
+            'fusion_accounting.openai_api_key', 'lm-studio-test-key')
+        from odoo.addons.fusion_accounting_ai.services.adapters.openai_adapter import OpenAIAdapter
+        adapter = OpenAIAdapter(self.env)
+        self.assertEqual(str(adapter.client.base_url).rstrip('/'),
+                         'http://localhost:1234/v1')
+
+    def test_openai_adapter_default_base_url_when_unset(self):
+        self.env['ir.config_parameter'].sudo().search([
+            ('key', '=', 'fusion_accounting.openai_base_url')
+        ]).unlink()
+        from odoo.addons.fusion_accounting_ai.services.adapters.openai_adapter import OpenAIAdapter
+        adapter = OpenAIAdapter(self.env)
+        self.assertIn('api.openai.com', str(adapter.client.base_url))