feat: Add professional hierarchical documentation

- Created comprehensive README.md with Mermaid diagrams, badges, and TOC
- Added docs/ directory with 7 sections and 14 markdown files
- Included architecture diagrams, flowcharts, and sequence diagrams
- All documentation is fully interlinked with cross-references
- Added ISO storage location on Proxmox development server
- Included troubleshooting guide and evaluation management docs
- All config files (Packer, Terraform, Ansible, Forgejo) documented
- Added icons and visual elements throughout documentation

terraform/variables.tf

@@ -0,0 +1,10 @@
+variable "build_id" {
+  description = "Unique identifier for the build"
+  type        = string
+}
+
+variable "template_vm_id" {
+  description = "VM ID of the Packer-built template"
+  type        = number
+  default     = 9000
+}