feat: self-hosted 모드 (#41) — 내 NAS/PC + 공인 IP로 발행

.gitattributes

@@ -0,0 +1,5 @@
+# Shell-executable scripts carry a shebang (#!/usr/bin/env node). A CRLF shebang
+# breaks execution on Unix and breaks esbuild/vite hashbang stripping when the
+# file is imported from a test (test/skill.test.ts fails to parse on a CRLF
+# checkout). Force LF regardless of the contributor's core.autocrlf.
+*.mjs text eol=lf