Feat(video): Implement full video ingestion pipeline using yt-dlp, Whisper transcription, and LLM summarization; updates Ollama client to support options.

backend/paths.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import os
+import sys
 from pathlib import Path
 
 
@@ -87,6 +88,25 @@ def library_root() -> Path:
     return _ensure_dir(DEFAULT_LIB_ROOT)
 
 
+def tool_root() -> Path:
+    explicit_path = _path_from_env("HEIMGEIST_TOOL_DIR")
+    if explicit_path is not None:
+        return _ensure_dir(explicit_path)
+
+    base_dir = data_dir()
+    if base_dir is not None:
+        return _ensure_dir(base_dir / "tools")
+
+    if sys.platform == "darwin":
+        return _ensure_dir(Path.home() / "Library" / "Application Support" / "Heimgeist" / "tools")
+    if os.name == "nt":
+        appdata = os.getenv("LOCALAPPDATA") or os.getenv("APPDATA")
+        root = Path(appdata) if appdata else Path.home() / "AppData" / "Local"
+        return _ensure_dir(root / "Heimgeist" / "tools")
+    xdg_data = Path(os.getenv("XDG_DATA_HOME", str(Path.home() / ".local" / "share")))
+    return _ensure_dir(xdg_data / "Heimgeist" / "tools")
+
+
 def sqlite_database_url(path: Path | None = None) -> str:
     target = path or database_path()
     return f"sqlite:///{target.as_posix()}"