Fix critical playbook execution errors in system_info role

Fix three critical errors preventing playbook execution:
1. Ansible syntax error in hypervisor detection
2. Missing OS-specific variable files
3. Invalid inventory plugin configuration

Changes to roles/system_info/tasks/detect_hypervisor.yml:
- Fix invalid failed_when at block level (line 75)
- Move failed_when: false to individual tasks within the block
- Ansible blocks don't support failed_when attribute directly
- Each libvirt detection task now has failed_when: false

Changes to roles/system_info/vars/:
- Create Debian.yml with Debian/Ubuntu specific variables
- Create RedHat.yml with RHEL/CentOS/Rocky/Alma variables
- Create Suse.yml with SUSE/openSUSE variables
- Define OS-specific package names and paths
- Fixes "Could not find or access 'Debian.yml'" error

Changes to inventories/development/libvirt_kvm.yml:
- Fix plugin name: libvirt_kvm → community.libvirt.libvirt
- Update URI to use local system: qemu:///system
- Fix compose variables: use ansible_libvirt_* prefix
- Fix groups conditions to use ansible_libvirt_state
- Fix keyed_groups to use ansible_libvirt_* variables
- Remove unsupported hypervisors array configuration
- Add strict: false for graceful error handling

Error details fixed:
ERROR 1: 'failed_when' is not a valid attribute for a Block
  Location: detect_hypervisor.yml:42
  Solution: Moved to individual tasks

ERROR 2: Could not find or access 'Debian.yml'
  Location: roles/system_info/vars/
  Solution: Created OS-specific variable files

ERROR 3: inventory config specifies unknown plugin 'libvirt_kvm'
  Location: inventories/development/libvirt_kvm.yml
  Solution: Corrected to community.libvirt.libvirt

Testing: These fixes resolve the playbook syntax errors and allow
the gather_system_info playbook to run successfully on available hosts.

Related to: ROLE_ANALYSIS_AND_IMPROVEMENTS.md recommendations

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

roles/system_info/vars/RedHat.yml

@@ -0,0 +1,19 @@
+---
+# OS-specific variables for RedHat family (RHEL, CentOS, Rocky, AlmaLinux)
+
+# Package names for RedHat/CentOS/Rocky/AlmaLinux
+system_info_packages:
+  - lshw
+  - dmidecode
+  - pciutils
+  - usbutils
+  - smartmontools
+  - ethtool
+  - sysstat
+
+# Service names
+system_info_audit_service: auditd
+
+# Paths
+system_info_resolv_conf: /etc/resolv.conf
+system_info_network_config: /etc/sysconfig/network-scripts/