feat: implement service-specific Modal API keys with auto processor pattern (#528)

* fix: refactor modal API key configuration for better separation of concerns

- Split generic MODAL_API_KEY into service-specific keys:
  - TRANSCRIPT_API_KEY for transcription service
  - DIARIZATION_API_KEY for diarization service
  - TRANSLATE_API_KEY for translation service
- Remove deprecated *_MODAL_API_KEY settings
- Add proper validation to ensure URLs are set when using modal processors
- Update README with new configuration format

BREAKING CHANGE: Configuration keys have changed. Update your .env file:
- TRANSCRIPT_MODAL_API_KEY → TRANSCRIPT_API_KEY
- LLM_MODAL_API_KEY → (removed, use TRANSCRIPT_API_KEY)
- Add DIARIZATION_API_KEY and TRANSLATE_API_KEY if using those services

* fix: update Modal backend configuration to use service-specific API keys

- Changed from generic MODAL_API_KEY to service-specific keys:
  - TRANSCRIPT_MODAL_API_KEY for transcription
  - DIARIZATION_MODAL_API_KEY for diarization
  - TRANSLATION_MODAL_API_KEY for translation
- Updated audio_transcript_modal.py and audio_diarization_modal.py to use modal_api_key parameter
- Updated documentation in README.md, CLAUDE.md, and env.example

* feat: implement auto/modal pattern for translation processor

- Created TranscriptTranslatorAutoProcessor following the same pattern as transcript/diarization
- Created TranscriptTranslatorModalProcessor with TRANSLATION_MODAL_API_KEY support
- Added TRANSLATION_BACKEND setting (defaults to "modal")
- Updated all imports to use TranscriptTranslatorAutoProcessor instead of TranscriptTranslatorProcessor
- Updated env.example with TRANSLATION_BACKEND and TRANSLATION_MODAL_API_KEY
- Updated test to expect TranscriptTranslatorModalProcessor name
- All tests passing

* refactor: simplify transcript_translator base class to match other processors

- Moved all implementation from base class to modal processor
- Base class now only defines abstract _translate method
- Follows the same minimal pattern as audio_diarization and audio_transcript base classes
- Updated test mock to use _translate instead of get_translation
- All tests passing

* chore: clean up settings and improve type annotations

- Remove deprecated generic API key variables from settings
- Add comments to group Modal-specific settings
- Improve type annotations for modal_api_key parameters

* fix: typing

* fix: passing key to openai

* test: fix rtc test failing due to change on transcript

It also correctly setup database from sqlite, in case our configuration
is setup to postgres.

* ci: deactivate translation backend by default

* test: fix modal->mock

* refactor: implementing igor review, mock to passthrough

server/tests/conftest.py

@@ -7,15 +7,11 @@ import pytest
 @pytest.fixture(scope="function", autouse=True)
 @pytest.mark.asyncio
 async def setup_database():
-    from reflector.settings import settings
+    from reflector.db import engine, metadata  # noqa
 
-    with NamedTemporaryFile() as f:
-        settings.DATABASE_URL = f"sqlite:///{f.name}"
-        from reflector.db import engine, metadata
-
-        metadata.create_all(bind=engine)
-
-        yield
+    metadata.drop_all(bind=engine)
+    metadata.create_all(bind=engine)
+    yield
 
 
 @pytest.fixture
@@ -33,9 +29,6 @@ def dummy_processors():
         patch(
             "reflector.processors.transcript_final_summary.TranscriptFinalSummaryProcessor.get_short_summary"
         ) as mock_short_summary,
-        patch(
-            "reflector.processors.transcript_translator.TranscriptTranslatorProcessor.get_translation"
-        ) as mock_translate,
     ):
         from reflector.processors.transcript_topic_detector import TopicResponse
 
@@ -45,9 +38,7 @@ def dummy_processors():
         mock_title.return_value = "LLM Title"
         mock_long_summary.return_value = "LLM LONG SUMMARY"
         mock_short_summary.return_value = "LLM SHORT SUMMARY"
-        mock_translate.return_value = "Bonjour le monde"
         yield (
-            mock_translate,
             mock_topic,
             mock_title,
             mock_long_summary,
@@ -105,6 +96,27 @@ async def dummy_diarization():
         yield
 
 
+@pytest.fixture
+async def dummy_transcript_translator():
+    from reflector.processors.transcript_translator import TranscriptTranslatorProcessor
+
+    class TestTranscriptTranslatorProcessor(TranscriptTranslatorProcessor):
+        async def _translate(self, text: str) -> str:
+            source_language = self.get_pref("audio:source_language", "en")
+            target_language = self.get_pref("audio:target_language", "en")
+            return f"{source_language}:{target_language}:{text}"
+
+    def mock_new(cls, *args, **kwargs):
+        return TestTranscriptTranslatorProcessor(*args, **kwargs)
+
+    with patch(
+        "reflector.processors.transcript_translator_auto"
+        ".TranscriptTranslatorAutoProcessor.__new__",
+        mock_new,
+    ):
+        yield
+
+
 @pytest.fixture
 async def dummy_llm():
     from reflector.llm import LLM

server/tests/test_processors_pipeline.py

@@ -33,7 +33,7 @@ async def test_basic_process(
 
     # validate the events
     assert marks["TranscriptLinerProcessor"] == 1
-    assert marks["TranscriptTranslatorProcessor"] == 1
+    assert marks["TranscriptTranslatorPassthroughProcessor"] == 1
     assert marks["TranscriptTopicDetectorProcessor"] == 1
     assert marks["TranscriptFinalSummaryProcessor"] == 1
     assert marks["TranscriptFinalTitleProcessor"] == 1

server/tests/test_transcripts_rtc_ws.py

@@ -67,6 +67,7 @@ async def test_transcript_rtc_and_websocket(
     dummy_transcript,
     dummy_processors,
     dummy_diarization,
+    dummy_transcript_translator,
     dummy_storage,
     fake_mp3_upload,
     appserver,
@@ -164,7 +165,7 @@ async def test_transcript_rtc_and_websocket(
     assert "TRANSCRIPT" in eventnames
     ev = events[eventnames.index("TRANSCRIPT")]
     assert ev["data"]["text"].startswith("Hello world.")
-    assert ev["data"]["translation"] == "Bonjour le monde"
+    assert ev["data"]["translation"] is None
 
     assert "TOPIC" in eventnames
     ev = events[eventnames.index("TOPIC")]
@@ -224,6 +225,7 @@ async def test_transcript_rtc_and_websocket_and_fr(
     dummy_transcript,
     dummy_processors,
     dummy_diarization,
+    dummy_transcript_translator,
     dummy_storage,
     fake_mp3_upload,
     appserver,
@@ -330,7 +332,7 @@ async def test_transcript_rtc_and_websocket_and_fr(
     assert "TRANSCRIPT" in eventnames
     ev = events[eventnames.index("TRANSCRIPT")]
     assert ev["data"]["text"].startswith("Hello world.")
-    assert ev["data"]["translation"] == "Bonjour le monde"
+    assert ev["data"]["translation"] == "en:fr:Hello world."
 
     assert "TOPIC" in eventnames
     ev = events[eventnames.index("TOPIC")]