feat: database models and Alembic migrations — User, Recording, Transcription, Protocol, PromptTemplate, ExportFile

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

backend/app/models/__init__.py

@@ -0,0 +1,23 @@
+from app.models.base import Base
+from app.models.export_file import ExportFile, ExportFormat
+from app.models.prompt_template import PromptTemplate, TemplateType
+from app.models.protocol import Protocol, ProtocolStatus
+from app.models.recording import Recording, RecordingSource, RecordingStatus
+from app.models.transcription import Transcription
+from app.models.user import User, UserRole
+
+__all__ = [
+    "Base",
+    "User",
+    "UserRole",
+    "Recording",
+    "RecordingSource",
+    "RecordingStatus",
+    "Transcription",
+    "Protocol",
+    "ProtocolStatus",
+    "PromptTemplate",
+    "TemplateType",
+    "ExportFile",
+    "ExportFormat",
+]