refactor: use module_defaults for proxmox API connection

- Replace YAML merge keys (<<:) with module_defaults block in main.yml
- Simplify connection variables to individual vars instead of dictionary
- Remove redundant connection params from individual task files
- Document standalone task usage requires play-level module_defaults
- Update README examples with new variable pattern

README.md

@@ -43,15 +43,32 @@ ansible-galaxy collection install patrickj.infrastructure
 
 ## Quick Start
 
+### Proxmox API Configuration
+
+Set up your Proxmox API connection variables in group vars:
+
+```yaml
+# group_vars/all.yml
+proxmox_api_host: "10.0.1.1"
+proxmox_api_port: 8006
+proxmox_api_user: "automation@pve"
+proxmox_api_token_id: "mytoken"
+proxmox_api_token_secret: "{{ vault_proxmox_token }}"
+proxmox_api_validate_certs: false
+proxmox_node: "pve01"
+```
+
 ### Basic Proxmox LXC Container Setup
+
 ```yaml
 - name: Create and start an LXC container
   hosts: localhost
   connection: local
   vars:
-    - container_hostname: new-debian-container
-    - os_template: "local:vztmpl/debian-12_amd64.tar.zst"
-    - container_ipv4: "10.0.0.99"
+    lxc_vmid: 100
+    lxc_hostname: new-debian-container
+    lxc_template: "local:vztmpl/debian-12_amd64.tar.zst"
+    lxc_ipv4: "10.0.0.99/24"
   roles:
     - role: proxmox_lxc_provision
 
@@ -64,7 +81,7 @@ ansible-galaxy collection install patrickj.infrastructure
       vars:
         password: "{{ admin_password }}"
         ssh_pubkey_file: "~/.ssh/id_rsa.pub"
-    
+
     - include_role:
         name: patrickj.infrastructure.nvidia_drivers
       vars: