refactor: extract scheduler to standalone repository

Scheduler service moved to git.schweitz.net/jpmschweitzer/scheduler
- Source code removed from this repository
- Stack file updated to use container image from Gitea registry
- Added Gitea Actions runner to gitea stack for CI/CD
- Documentation updated with external service reference

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/settings.local.json

@@ -6,7 +6,10 @@
       "Bash(docker ps:*)",
       "Bash(docker inspect:*)",
       "Bash(tree:*)",
-      "Bash(nvidia-smi:*)"
+      "Bash(nvidia-smi:*)",
+      "Bash(find:*)",
+      "Bash(grep:*)",
+      "Bash(cat:*)"
     ],
     "deny": [],
     "ask": []