Add DevControlBot garage: skeleton bot with release/debug build script

A minimal Tank Royale bot that boots and stands still. Body, gun and radar
are set to white once at init (team convention: white = not programmed yet);
the tick loop only calls go().

- DevControlBot/ holds the single bot module, its metadata JSON, the
  BotLauncher entry script and the nimble file
- DevControlBot.sh is a thin wrapper around the runBot nimble task:
  release build by default, --debug for the classic diagnostic build
- dependencies resolve at run time from the global nimble store via
  `nimble path`; optional .env (gitignored) supplies env vars such as
  SERVER_URL, with existing environment variables taking precedence
- build happens in a throwaway mktemp dir removed on exit; no artifacts

DevControlBot_garage/DevControlBot/DevControlBot.json

@@ -0,0 +1,9 @@
+{
+  "name": "DevControlBot",
+  "version": "0.1.0",
+  "authors": ["Davide Cappellini"],
+  "description": "Control skeleton bot — does nothing, bright colors",
+  "gameTypes": ["classic", "1v1"],
+  "platform": "Nim",
+  "programmingLang": "Nim"
+}