fix(ci): move Separator import inside functions for Modal deploy

The audio_separator.separator import has heavy dependencies (torch, etc.)
that aren't available on the GitHub Actions runner. Moving the import
inside the Modal functions ensures it only runs in the container where
all dependencies are installed.

Also added fastapi and filetype to workflow dependencies.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: beveradb

.github/workflows/deploy-to-modal.yml

@@ -33,8 +33,11 @@ jobs:
         with:
           python-version: '3.12'
 
-      - name: Install Modal CLI
-        run: pip install modal
+      - name: Install Modal CLI and dependencies
+        run: |
+          pip install modal
+          # Install dependencies needed to parse deploy_modal.py
+          pip install fastapi filetype
 
       - name: Deploy to Modal
         env:

audio_separator/remote/deploy_modal.py

@@ -40,8 +40,8 @@
 import filetype
 import modal
 
-# Local imports
-from audio_separator.separator import Separator
+# Note: Separator is imported inside functions to allow Modal to parse this file
+# without requiring audio_separator to be installed on the deployment machine
 
 # Constants
 DEFAULT_MODEL_NAME = "default"  # Used when no model is specified
@@ -195,6 +195,8 @@ def separate_audio_function(
     """
     Separate audio into stems using one or more models
     """
+    from audio_separator.separator import Separator
+
     if task_id is None:
         task_id = str(uuid.uuid4())
 
@@ -489,6 +491,8 @@ def list_available_models() -> dict:
     """
     List available separation models using the same approach as CLI
     """
+    from audio_separator.separator import Separator
+
     # Use the persistent model directory
     model_dir = "/models"
 
@@ -510,6 +514,8 @@ def get_simplified_models(filter_sort_by: str = None) -> dict:
     """
     Get simplified model list using the same approach as CLI --list_models
     """
+    from audio_separator.separator import Separator
+
     # Use the persistent model directory
     model_dir = "/models"