feat!: migrate to OpenAI native tool calls and fix circular deps (#fuck-gemini)

- Fix circular dependencies in agent/tools
- Migrate from custom JSON to OpenAI tool calls format
- Add async streaming (step_stream, complete_stream)
- Simplify prompt system and remove token counting
- Add 5 new API endpoints (/health, /v1/models, /api/memory/*)
- Add 3 new tools (get_torrent_by_index, add_torrent_by_index, set_language)
- Fix all 500 tests and add coverage config (80% threshold)
- Add comprehensive docs (README, pytest guide)

BREAKING: LLM interface changed, memory injection via get_memory()

application/filesystem/list_folder.py

@@ -1,7 +1,9 @@
 """List folder use case."""
+
 import logging
 
 from infrastructure.filesystem import FileManager
+
 from .dto import ListFolderResponse
 
 logger = logging.getLogger(__name__)
@@ -10,43 +12,41 @@ logger = logging.getLogger(__name__)
 class ListFolderUseCase:
     """
     Use case for listing folder contents.
-    
+
     This orchestrates the FileManager to list folders.
     """
-    
+
     def __init__(self, file_manager: FileManager):
         """
         Initialize use case.
-        
+
         Args:
             file_manager: FileManager instance
         """
         self.file_manager = file_manager
-    
+
     def execute(self, folder_type: str, path: str = ".") -> ListFolderResponse:
         """
         List contents of a folder.
-        
+
         Args:
             folder_type: Type of folder to list (download, tvshow, movie, torrent)
             path: Relative path within the folder (default: ".")
-        
+
         Returns:
             ListFolderResponse with folder contents or error information
         """
         result = self.file_manager.list_folder(folder_type, path)
-        
+
         if result.get("status") == "ok":
             return ListFolderResponse(
                 status="ok",
                 folder_type=result.get("folder_type"),
                 path=result.get("path"),
                 entries=result.get("entries"),
-                count=result.get("count")
+                count=result.get("count"),
             )
         else:
             return ListFolderResponse(
-                status="error",
-                error=result.get("error"),
-                message=result.get("message")
+                status="error", error=result.get("error"), message=result.get("message")
             )