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/commands.yml

@@ -0,0 +1,51 @@
+---
+# commands.yml - Execute commands on Prezenta devices
+# Provides structured command execution with logging and error handling
+
+- name: Execute Command on Prezenta Devices
+  hosts: "{{ target_devices | default('prezenta_devices') }}"
+  gather_facts: no
+  
+  vars:
+    command_to_run: "{{ command | default('pwd') }}"
+    command_user: pi
+    log_commands: true
+    
+  tasks:
+    - name: Display command execution info
+      debug:
+        msg: |
+          Executing on: {{ inventory_hostname }} ({{ ansible_host }})
+          Command: {{ command_to_run }}
+          User: {{ command_user }}
+    
+    - name: Execute command
+      shell: "{{ command_to_run }}"
+      register: command_result
+      become: yes
+      become_user: "{{ command_user }}"
+      ignore_errors: yes
+    
+    - name: Display command output
+      debug:
+        msg: |
+          Return Code: {{ command_result.rc }}
+          STDOUT:
+          {{ command_result.stdout }}
+          STDERR:
+          {{ command_result.stderr | default('None') }}
+    
+    - name: Log command execution
+      lineinfile:
+        path: "{{ app_directory }}/data/command_history.log"
+        line: "[{{ ansible_date_time.iso8601 }}] [{{ inventory_hostname }}] Command: {{ command_to_run }} | RC: {{ command_result.rc }}"
+        create: yes
+        state: present
+      delegate_to: "{{ inventory_hostname }}"
+      become: yes
+      when: log_commands
+    
+    - name: Fail if command failed
+      fail:
+        msg: "Command failed on {{ inventory_hostname }} with return code {{ command_result.rc }}"
+      when: command_result.rc != 0 and fail_on_error | default(false)