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()

domain/movies/repositories.py

@@ -1,6 +1,6 @@
 """Movie repository interfaces (abstract)."""
+
 from abc import ABC, abstractmethod
-from typing import List, Optional
 
 from ..shared.value_objects import ImdbId
 from .entities import Movie
@@ -9,64 +9,64 @@ from .entities import Movie
 class MovieRepository(ABC):
     """
     Abstract repository for movie persistence.
-    
+
     This defines the interface that infrastructure implementations must follow.
     """
-    
+
     @abstractmethod
     def save(self, movie: Movie) -> None:
         """
         Save a movie to the repository.
-        
+
         Args:
             movie: Movie entity to save
         """
         pass
-    
+
     @abstractmethod
-    def find_by_imdb_id(self, imdb_id: ImdbId) -> Optional[Movie]:
+    def find_by_imdb_id(self, imdb_id: ImdbId) -> Movie | None:
         """
         Find a movie by its IMDb ID.
-        
+
         Args:
             imdb_id: IMDb ID to search for
-        
+
         Returns:
             Movie if found, None otherwise
         """
         pass
-    
+
     @abstractmethod
-    def find_all(self) -> List[Movie]:
+    def find_all(self) -> list[Movie]:
         """
         Get all movies in the repository.
-        
+
         Returns:
             List of all movies
         """
         pass
-    
+
     @abstractmethod
     def delete(self, imdb_id: ImdbId) -> bool:
         """
         Delete a movie from the repository.
-        
+
         Args:
             imdb_id: IMDb ID of the movie to delete
-        
+
         Returns:
             True if deleted, False if not found
         """
         pass
-    
+
     @abstractmethod
     def exists(self, imdb_id: ImdbId) -> bool:
         """
         Check if a movie exists in the repository.
-        
+
         Args:
             imdb_id: IMDb ID to check
-        
+
         Returns:
             True if exists, False otherwise
         """