feat: rename rails/ to tools/ and add service tool suites

Rename the `rails/` directory to `tools/` for agent discoverability —
agents frequently failed to locate helper scripts due to the non-intuitive
directory name. Add backward-compat symlink `rails/ → tools/`.

New tool suites:
- Authentik: auth-token, user-list, user-create, group-list, app-list,
  flow-list, admin-status (8 scripts)
- Coolify: team-list, project-list, service-list, service-status, deploy,
  env-set (7 scripts)
- Woodpecker: pipeline-list, pipeline-status, pipeline-trigger (3 stubs)
- GLPI: session-init, computer-list, ticket-list, ticket-create, user-list
  (6 scripts)
- Health: stack-health.sh — stack-wide connectivity check

Infrastructure:
- Shared credential loader at tools/_lib/credentials.sh
- install.sh creates symlink + chmod on tool scripts
- All ~253 rails/ path references updated across 68+ files

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

guides/AUTHENTICATION.md

@@ -1,7 +1,7 @@
 # Authentication & Authorization Guide
 
 ## Before Starting
-1. Check assigned issue: `~/.config/mosaic/rails/git/issue-list.sh -a @me`
+1. Check assigned issue: `~/.config/mosaic/tools/git/issue-list.sh -a @me`
 2. Review existing auth implementation in codebase
 3. Review Vault secrets structure: `docs/vault-secrets-structure.md`
 
@@ -115,6 +115,41 @@ class TestAuthentication:
         pass
 ```
 
+## Authentik SSO Administration
+
+Authentik is the identity provider for the Mosaic Stack. Use the Authentik tool suite for administration.
+
+### Tool Suite
+
+```bash
+# System health
+~/.config/mosaic/tools/authentik/admin-status.sh
+
+# User management
+~/.config/mosaic/tools/authentik/user-list.sh
+~/.config/mosaic/tools/authentik/user-create.sh -u <username> -n <name> -e <email>
+
+# Group and app management
+~/.config/mosaic/tools/authentik/group-list.sh
+~/.config/mosaic/tools/authentik/app-list.sh
+~/.config/mosaic/tools/authentik/flow-list.sh
+```
+
+### Registering an OAuth Application
+
+1. Create an OAuth2 provider in Authentik admin (Applications > Providers)
+2. Create an application linked to the provider (Applications > Applications)
+3. Configure redirect URIs for the application
+4. Store client_id and client_secret in Vault: `secret-{env}/{service}/oauth/authentik/`
+5. Verify with: `~/.config/mosaic/tools/authentik/app-list.sh`
+
+### API Reference
+
+- Base URL: `https://auth.diversecanvas.com`
+- API prefix: `/api/v3/`
+- OpenAPI schema: `/api/v3/schema/`
+- Auth: Bearer token (obtained via `auth-token.sh`)
+
 ## Common Vulnerabilities to Avoid
 
 1. **Broken Authentication**