Remove casaos-marine-store submodule

.gitmodules

@@ -2,10 +2,6 @@
 	path = halos-pi-gen
 	url = git@github.com:hatlabs/halos-pi-gen.git
 	branch = halos
-[submodule "casaos-marine-store"]
-	path = casaos-marine-store
-	url = git@github.com:hatlabs/casaos-marine-store.git
-	branch = main
 [submodule "apt.hatlabs.fi"]
 	path = apt.hatlabs.fi
 	url = git@github.com:hatlabs/apt.hatlabs.fi.git

CLAUDE.md

@@ -12,7 +12,6 @@ This is a monorepo with multiple independent components managed as git submodule
 
 - **[halos-pi-gen/CLAUDE.md](halos-pi-gen/CLAUDE.md)**: Detailed pi-gen build system, stages, image variants, CI/CD workflows
 - **[runtipi-marine-app-store/CLAUDE.md](runtipi-marine-app-store/CLAUDE.md)**: Runtipi marine app store structure and curation
-- **[casaos-marine-store/CLAUDE.md](casaos-marine-store/CLAUDE.md)**: CasaOS marine app store (legacy, transitioning to Runtipi)
 
 **When to use which documentation:**
 - Working in a specific submodule? Read that submodule's CLAUDE.md for detailed context
@@ -47,8 +46,6 @@ halos-distro/                          # Monorepo aggregator (this repo)
     │   └── config.*                   # Image variant configurations
     ├── runtipi-marine-app-store/      # Runtipi marine app store
     │   └── CLAUDE.md                  # App store documentation
-    ├── casaos-marine-store/           # CasaOS marine apps (legacy)
-    │   └── CLAUDE.md                  # App store documentation
     └── apt.hatlabs.fi/                # Custom APT repository
 ```