chore: rename cameleer3 to cameleer

Rename Java packages from com.cameleer3 to com.cameleer, module
directories from cameleer3-* to cameleer-*, and all references
throughout workflows, Dockerfiles, docs, migrations, and pom.xml.

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

docs/superpowers/specs/2026-04-02-admin-context-separation-design.md

@@ -1,6 +1,6 @@
 # Composable Sidebar with Accordion & Collapse
 
-**Issue:** [#112](https://gitea.siegeln.net/cameleer/cameleer3-server/issues/112)
+**Issue:** [#112](https://gitea.siegeln.net/cameleer/cameleer-server/issues/112)
 **Date:** 2026-04-02
 **Scope:** Design system refactor + server UI migration
 
@@ -346,7 +346,7 @@ This is a two-repo change:
    - Update barrel exports
    - Bump version
 
-2. **Server UI migration** (cameleer3-server repo):
+2. **Server UI migration** (cameleer-server repo):
    - Move tree-building functions to local utils
    - Rewrite sidebar composition in `LayoutShell` using new compound API
    - Add accordion logic for admin mode