feat: expose archive host paths in project payload (REQ-172)

backend/config.py

@@ -22,6 +22,27 @@ DB_PATH = os.path.join(DATA_DIR, "app.db")
 # they store an absolute one — but this is the default the UI starts browsing from.
 VIDEO_ROOT = os.path.abspath(os.environ.get("VIDEO_ARCHIVE", os.path.join(DATA_DIR, "archive")))
 
+
+def archive_host_paths() -> dict:
+    """Where the archive sits on the host — for the copy-path buttons (REQ-172).
+
+    ponytail: relative VIDEO_ARCHIVE_HOST (./data/archive) cannot be resolved
+    inside the container; set it absolute in .env or the buttons stay hidden."""
+    import re
+    host = os.environ.get("VIDEO_ARCHIVE_HOST", "")
+    if os.path.isabs(host):
+        linux = host.rstrip("/")
+    elif VIDEO_ROOT != "/videos":   # bare-metal: VIDEO_ROOT is already the host path
+        linux = VIDEO_ROOT
+    else:
+        return {"linux": None, "windows": None}
+    if re.match(r"^[A-Za-z]:[\\/]", linux):
+        return {"linux": None, "windows": linux.replace("/", "\\")}
+    distro = os.environ.get("WSL_DISTRO_NAME", "")
+    windows = f"\\\\wsl.localhost\\{distro}\\" + linux.lstrip("/").replace("/", "\\") if distro else None
+    return {"linux": linux, "windows": windows}
+
+
 # Vite dev server needs cross-origin access; in Docker nginx proxies /api and
 # this is irrelevant.
 CORS_ORIGINS = [

backend/projects.py

@@ -178,6 +178,8 @@ def _row_to_dict(cur, row) -> dict:
         "secondary_model_classes": sec_classes,
         "base_model_fallback": PRETRAINED[row["label_type"]],
         "video_root": row["video_root"],
+        "video_root_linux": config.archive_host_paths()["linux"],
+        "video_root_windows": config.archive_host_paths()["windows"],
         "val_every": row["val_every"],
         "created_at": row["created_at"],
         "classes": classes,