Migrate module path from kyle/ to mc/ org

All import paths updated from git.wntrmute.dev/kyle/mcias to
git.wntrmute.dev/mc/mcias to match the Gitea organization.
Includes main module and clients/go submodule.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ARCHITECTURE.md

@@ -1377,7 +1377,7 @@ Error types exposed by every library:
 
 #### Go (`clients/go/`)
 
-- Module: `git.wntrmute.dev/kyle/mcias/clients/go`
+- Module: `git.wntrmute.dev/mc/mcias/clients/go`
 - Package: `mciasgoclient`
 - HTTP: `net/http` with custom `*tls.Config` for CA cert
 - Token state: guarded by `sync.RWMutex`