new RPG system

tests/test_rpg_locale.py

@@ -0,0 +1,22 @@
+from services.rpg_locale import infer_rp_language, locale_instruction
+
+
+def test_infer_ru_from_cyrillic_chat():
+    msgs = [
+        {"role": "user", "content": "Привет, как дела?"},
+        {"role": "assistant", "content": "Нормально, идём дальше."},
+    ]
+    assert infer_rp_language(msgs) == "ru"
+
+
+def test_infer_en_from_latin_chat():
+    msgs = [
+        {"role": "user", "content": "Hello, how are you?"},
+        {"role": "assistant", "content": "Fine, let's continue."},
+    ]
+    assert infer_rp_language(msgs) == "en"
+
+
+def test_locale_instruction_ru():
+    assert "Russian" in locale_instruction("ru")
+    assert "MUST be in Russian" in locale_instruction("ru")