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()

agent/tools/__init__.py

@@ -1,11 +1,20 @@
-"""Tools module - filesystem and API tools."""
-from .filesystem import set_path_for_folder, list_folder
-from .api import find_media_imdb_id, find_torrent, add_torrent_to_qbittorrent
+"""Tools module - filesystem and API tools for the agent."""
+
+from .api import (
+    add_torrent_by_index,
+    add_torrent_to_qbittorrent,
+    find_media_imdb_id,
+    find_torrent,
+    get_torrent_by_index,
+)
+from .filesystem import list_folder, set_path_for_folder
 
 __all__ = [
-    'set_path_for_folder',
-    'list_folder',
-    'find_media_imdb_id',
-    'find_torrent',
-    'add_torrent_to_qbittorrent',
+    "set_path_for_folder",
+    "list_folder",
+    "find_media_imdb_id",
+    "find_torrent",
+    "get_torrent_by_index",
+    "add_torrent_to_qbittorrent",
+    "add_torrent_by_index",
 ]