Add multilingual STT support and config UI/runtime updates

tests/test_config_ui.py

@@ -0,0 +1,60 @@
+import sys
+import unittest
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+SRC = ROOT / "src"
+if str(SRC) not in sys.path:
+    sys.path.insert(0, str(SRC))
+
+from config import Config
+from config_ui import (
+    RUNTIME_MODE_EXPERT,
+    RUNTIME_MODE_MANAGED,
+    apply_canonical_runtime_defaults,
+    infer_runtime_mode,
+)
+
+
+class ConfigUiRuntimeModeTests(unittest.TestCase):
+    def test_infer_runtime_mode_defaults_to_managed(self):
+        cfg = Config()
+        self.assertEqual(infer_runtime_mode(cfg), RUNTIME_MODE_MANAGED)
+
+    def test_infer_runtime_mode_detects_expert_overrides(self):
+        cfg = Config()
+        cfg.llm.provider = "external_api"
+        cfg.external_api.enabled = True
+        self.assertEqual(infer_runtime_mode(cfg), RUNTIME_MODE_EXPERT)
+
+    def test_apply_canonical_runtime_defaults_resets_expert_fields(self):
+        cfg = Config()
+        cfg.stt.provider = "local_whisper"
+        cfg.llm.provider = "external_api"
+        cfg.external_api.enabled = True
+        cfg.external_api.base_url = "https://example.local/v1"
+        cfg.external_api.model = "custom-model"
+        cfg.external_api.api_key_env_var = "CUSTOM_KEY"
+        cfg.external_api.timeout_ms = 321
+        cfg.external_api.max_retries = 8
+        cfg.models.allow_custom_models = True
+        cfg.models.whisper_model_path = "/tmp/custom-whisper.bin"
+        cfg.models.llm_model_path = "/tmp/custom-model.gguf"
+
+        apply_canonical_runtime_defaults(cfg)
+
+        self.assertEqual(cfg.stt.provider, "local_whisper")
+        self.assertEqual(cfg.llm.provider, "local_llama")
+        self.assertFalse(cfg.external_api.enabled)
+        self.assertEqual(cfg.external_api.base_url, "https://api.openai.com/v1")
+        self.assertEqual(cfg.external_api.model, "gpt-4o-mini")
+        self.assertEqual(cfg.external_api.api_key_env_var, "AMAN_EXTERNAL_API_KEY")
+        self.assertEqual(cfg.external_api.timeout_ms, 15000)
+        self.assertEqual(cfg.external_api.max_retries, 2)
+        self.assertFalse(cfg.models.allow_custom_models)
+        self.assertEqual(cfg.models.whisper_model_path, "")
+        self.assertEqual(cfg.models.llm_model_path, "")
+
+
+if __name__ == "__main__":
+    unittest.main()