chore: migrate module path from git.t-juice.club to code.t-juice.club

Update Go module path and all import references for Gitea to Forgejo
host migration.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -46,7 +46,7 @@ The nixpkgs/options/hm servers share a database-backed architecture:
 - **Build System**: Nix flakes
 - **Databases**: PostgreSQL and SQLite (both fully supported)
 - **Protocol**: MCP (Model Context Protocol) - JSON-RPC over STDIO or HTTP/SSE
-- **Module Path**: `git.t-juice.club/torjus/labmcp`
+- **Module Path**: `code.t-juice.club/torjus/labmcp`
 
 ## Project Status