feat(setup)!: require Node 22.12+ and drop Node 20 (#152)

better-sqlite3 stopped publishing prebuilt binaries for Node 20's ABI
(115) in 12.10.0 - upstream, not a mirror gap:

    12.8.0 / 12.9.0   115 127 131 137 141
    12.10.0+              127 137 141 147

`better-sqlite3: ^12.8.0` resolves well past that, so every Node 20
install 404'd on the CDN, fell through to the source build, and demanded
Python plus a C++ toolchain before the bot could start at all. package.json
went on claiming `^20.19.0` worked, and the README went on recommending
Node 20 as one of two blessed versions. It was not a supported
configuration in any meaningful sense - it was a trap.

So say so up front: engines, both setup scripts, and the Docker images now
require Node 22.12+ (or 24+, which still needs a source build for opus).
The version gate in setup.bat / setup.sh is kept byte-identical to the
engines range, as before.

Also copy scripts/lib/console-log.mjs into the production image. The
previous commit had check-native.mjs import it, and the Dockerfile copies
check-native.mjs in on its own for `docker exec ... npm start` - without
its dependency that preflight now dies with ERR_MODULE_NOT_FOUND.

BREAKING CHANGE: Node 20 is no longer supported. Node 22.12 LTS or newer
is required; setup refuses to run on anything older.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

package.json

@@ -4,7 +4,7 @@
   "description": "TeamSpeak music bot with NetEase Cloud Music and QQ Music support",
   "type": "module",
   "engines": {
-    "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+    "node": "^22.12.0 || >=24.0.0"
   },
   "scripts": {
     "dev": "tsx watch src/index.ts",