Add Ansible integration for device management and deployment automation

- Added ansible/ directory with playbooks for:
  * deploy.yml: Update applications on devices from git
  * commands.yml: Execute arbitrary commands on devices
  * system_update.yml: OS updates and health checks
  * inventory.ini: Device and group configuration
  * README.md: Comprehensive Ansible guide
  * requirements.txt: Installation instructions

- Added ansible_integration.py: Python module wrapping Ansible operations
- Added utils_ansible.py: Updated utilities using Ansible instead of HTTP commands

Key benefits:
- Idempotent operations with error recovery
- Comprehensive logging and backup
- Multi-device orchestration
- Better reliability and control
- Replaces unreliable direct HTTP command execution

ansible/inventory.ini

@@ -0,0 +1,34 @@
+# Ansible Inventory for Prezenta Work Devices
+# This inventory file manages all Raspberry Pi devices running prezenta_work
+
+[all:vars]
+# Common variables for all devices
+ansible_user=pi
+ansible_password=Initial01!
+ansible_become=yes
+ansible_become_method=sudo
+ansible_become_password=Initial01!
+ansible_python_interpreter=/usr/bin/python3
+ansible_connection=ssh
+
+[prezenta_devices]
+# Raspberry Pi devices running the prezenta_work application
+# Format: device_name ansible_host=192.168.1.x
+
+device_1 ansible_host=192.168.1.20
+device_2 ansible_host=192.168.1.21
+device_3 ansible_host=192.168.1.22
+
+[prezenta_devices:vars]
+# Variables specific to prezenta devices
+app_directory=/srv/prezenta_work
+app_user=pi
+app_service=prezenta
+
+[monitoring_server]
+# Central monitoring server
+monitor ansible_host=192.168.1.103 ansible_user=root
+
+[local]
+# Local development/test
+localhost ansible_connection=local ansible_become=no