feat: ai-first intent detection with keyword fallback

tests/test_intent_analyzer.py

@@ -0,0 +1,24 @@
+import unittest
+
+from utils.intent_analyzer import detect_intent
+
+
+class IntentAnalyzerTests(unittest.TestCase):
+    def test_keyword_fallback_for_price(self):
+        d = detect_intent("这个怎么收费")
+        self.assertEqual(d.intent, "询价")
+        self.assertEqual(d.source, "keyword")
+
+    def test_keyword_fallback_for_greeting(self):
+        d = detect_intent("你好 在吗")
+        self.assertEqual(d.intent, "打招呼")
+        self.assertEqual(d.source, "keyword")
+
+    def test_unknown_intent(self):
+        d = detect_intent("abc123")
+        self.assertEqual(d.intent, "")
+        self.assertIn(d.source, ("none", ""))
+
+
+if __name__ == "__main__":
+    unittest.main()