Fix route ordering: /search before /{asset_id}

- /api/assets/search must be registered before /api/assets/{asset_id}
  to prevent FastAPI path param from catching 'search' as an asset_id.
  Returning a 422 with array detail caused frontend to show [object Object].
- Improve error message extraction in clearAssetGps catch block.

admin_server.py

@@ -1586,17 +1586,6 @@ def export_checkins_csv(asset_id: Optional[int] = Query(None)):
 # ─── Asset GPS Management ──────────────────────────────────────────────────
 
 
-@app.get("/api/assets/{asset_id}")
-def get_asset_admin(asset_id: int):
-    """Get a single asset by ID (admin)."""
-    conn = get_db()
-    row = conn.execute("SELECT * FROM assets WHERE id = ?", (asset_id,)).fetchone()
-    conn.close()
-    if row is None:
-        raise HTTPException(status_code=404, detail="Asset not found")
-    return row_to_dict(row)
-
-
 @app.get("/api/assets/search")
 def search_assets_admin(machine_id: str = Query(...)):
     """Search for an asset by machine_id (admin)."""
@@ -1610,6 +1599,16 @@ def search_assets_admin(machine_id: str = Query(...)):
     return row_to_dict(row)
 
 
+@app.get("/api/assets/{asset_id}")
+def get_asset_admin(asset_id: int):
+    """Get a single asset by ID (admin)."""
+    conn = get_db()
+    row = conn.execute("SELECT * FROM assets WHERE id = ?", (asset_id,)).fetchone()
+    conn.close()
+    if row is None:
+        raise HTTPException(status_code=404, detail="Asset not found")
+    return row_to_dict(row)
+
 @app.delete("/api/assets/{asset_id}/gps", status_code=204)
 def clear_asset_gps(asset_id: int):
     """Clear GPS coordinates from an asset (sets latitude/longitude to NULL)."""