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>

docs/EXTERNAL_SERVICES.md

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+# External Services
+
+Services that have been extracted to their own repositories but are still part of the overall infrastructure.
+
+---
+
+## Scheduler
+
+**Repository:** https://git.schweitz.net/jpmschweitzer/scheduler
+**Container Image:** `git.schweitz.net/jpmschweitzer/scheduler:latest`
+**Stack File:** `stacks/scheduler.yml` (remains in portainer-core)
+
+### Overview
+The Scheduler service handles system-wide maintenance orchestration including:
+- Docker config backups
+- Documentation mirroring
+- Task automation via REST API
+- Integration with Library Desk for consolidation jobs
+
+### Deployment
+- Container image built via Gitea Actions on release
+- Stack file in portainer-core defines volumes, environment, and network
+- Watchtower monitors for image updates
+
+### Development
+To make changes:
+1. Clone: `git clone gitea:jpmschweitzer/scheduler.git`
+2. Make changes
+3. Create a release in Gitea to trigger build
+4. Watchtower will auto-update the running container
+
+### API
+- Health: `http://scheduler:8090/health`
+- Tasks: `http://scheduler:8090/tasks` (requires API key)
+- Docs: `http://scheduler:8090/docs`
+
+---
+
+## Tatlock
+
+**Repository:** https://git.schweitz.net/jpmschweitzer/tatlock
+**Location:** `/home/jpmschweitzer/Projects/tatlock`
+
+### Overview
+Tatlock is a separate project maintained in its own repository.
+
+---
+
+## Future Migrations
+
+The following services are planned for extraction:
+- **core-api** - Infrastructure management API
+- **library-desk** - Knowledge management and consolidation service