feat: v4.1.0 -- workshop-ready (logo, path discovery, docs)

Players install from Steam Workshop instead of install.sh, which failed on
Windows (bash) and a Manjaro box (hard-coded Mods globs). Adds Logo +
logo.png the uploader ships, tools/steam_paths.py reading Steam's
libraryfolders.vdf (Flatpak/Snap/second disk/Windows), and README install
tiers plus in-game publishing steps.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014TkQMhvEyoFqKzeCC69N6o

mod.rules

@@ -22,10 +22,11 @@
 
 ID = ganter.auto_radiator
 Name = "Auto Radiator"
-Version = 4.0.0
+Version = 4.1.0
 CompatibleGameVersions = ["0.30.4c", "0.30.4"]
 ModifiesGameplay = true
 Author = "Tobias Ganter"
+Logo = "logo.png"
 
 Description = "Radiators switched OFF bank heat and vent only when the ship's heat storage is nearly full.\n\n"\
               "Thermal Canister Missiles are built from your ship's own heat, and in vanilla "\