feat(billing): service API-key generation + matching

Add _match_api_key() class method to fusion.billing.service, with a
TDD test suite (TestServiceApiKey) covering key generation, hash storage,
positive match, and rejection of bad/inactive keys. Also fix
fcb_test_on_trial.sh to use --http-port 8070, as Odoo 19 forces
http_spawn() even under --no-http when --test-enable is set.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

fusion_centralize_billing/tests/__init__.py

@@ -0,0 +1 @@
+from . import test_identity

fusion_centralize_billing/tests/test_identity.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+from odoo.tests.common import TransactionCase, tagged
+
+
+@tagged('post_install', '-at_install')
+class TestServiceApiKey(TransactionCase):
+
+    def setUp(self):
+        super().setUp()
+        self.Service = self.env['fusion.billing.service'].sudo()
+        self.service = self.Service.create({'name': 'NexaCloud', 'code': 'nexacloud'})
+
+    def test_generate_and_match_api_key(self):
+        raw = self.service.action_generate_api_key()
+        self.assertTrue(raw and len(raw) >= 20)
+        self.assertTrue(self.service.api_key_hash)
+        self.assertNotEqual(raw, self.service.api_key_hash)  # only the hash is stored
+        matched = self.Service._match_api_key(raw)
+        self.assertEqual(matched, self.service)
+
+    def test_match_api_key_rejects_unknown_and_inactive(self):
+        raw = self.service.action_generate_api_key()
+        self.assertFalse(self.Service._match_api_key('nope-not-a-key'))
+        self.service.active = False
+        self.assertFalse(self.Service._match_api_key(raw))