feat: IPv6 outbound rotation via curl --interface

- Add IPv6SourcePool for round-robin IP rotation
- fetchViaCurl: Bun.spawn + curl -6 --interface for source binding
- Auto-fallback to regular fetch when IPv6 connection fails
- Response decompression via --compressed flag
- Docker + GHCR build/deploy workflows
- 8 routable IPv6 addresses on VPS

.dockerignore

@@ -0,0 +1,8 @@
+node_modules
+.git
+.github
+dist
+.env
+.env.*
+*.test.ts
+CLAUDE.md