feat: sysops_agent — Docker/git self-management with auto-heal

Adds a new specialist agent that gives the AI system control over its
own infrastructure:

- sysops_tools.py: docker SDK (ps/logs/restart) + git CLI (pull/status/log)
  + Odoo channel notifier for autonomous action broadcasts
- sysops_agent.py: BaseAgent subclass handling on-demand chat requests,
  auto_heal() triggered by health failures, and sweep() for audits
- Background auto-heal loop (main.py): runs every 2 minutes, calls
  _get_failing_systems() and triggers auto_heal() when degraded
- health.py: extracted _get_failing_systems() helper reused by both
  the /health/detailed endpoint and the auto-heal loop
- docker-compose.yml: mount docker socket + /root/odoo workspace +
  SSH keys for git authentication
- Dockerfile: add git to apt-get
- requirements.txt: add docker==7.1.0 Python SDK

Auto-heal behavior:
  - Detects failing containers, restarts them, notifies all bot DM channels
  - Ollama (192.168.2.9) is flagged as external and skipped
  - On-demand via chat: "restart agent", "check logs", "pull latest code"

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

agent_service/agents/registry.py

@@ -16,6 +16,7 @@ _DEFAULT_CAPABILITIES = {
     'elearning_agent':  'eLearning — courses, slides, attendees, certifications',
     'employees_agent':  'HR — employees, contracts, attendance, leave requests',
     'odoo_doc_agent':   'Odoo 18 documentation and workflow guidance (internal use)',
+    'sysops_agent':     'System operations — Docker containers, git, logs, auto-healing',
 }