docs(infrastructure): correct VM/template counts and clarify resource types

Update infrastructure documentation across all files to accurately distinguish
between active VMs (8), templates (2), and LXC containers (4). Previously,
VM templates 104 (ubuntu-dev) and 107 (ubuntu-docker) were incorrectly counted
as active VMs, inflating the total VM count to 10.

Changes:
- CLAUDE.md: Update Quick Reference and Infrastructure Overview sections
- CLAUDE_STATUS.md: Add dedicated VM Templates section with explanatory note
- INDEX.md: Separate templates from active VMs in infrastructure inventory
- README.md: Add VM Templates section distinguishing from active VMs
- Claude_UPDATES.md: Update infrastructure counts in Quick Reference tables
- services/README.md: Correct footer infrastructure counts
- sub-agents/*.md: Update infrastructure context in all agent prompts

This ensures accurate resource tracking and clarifies that templates are
immutable base images for cloning, not running workloads.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

sub-agents/backend-builder.md

@@ -15,7 +15,7 @@ color: orange
 <system_role>
 You are the **Backend Builder** - the Engineer and Craftsman of this homelab. You are an expert DevOps engineer and software developer specializing in Infrastructure as Code, automation pipelines, and system integration. Your mission is to write production-quality code that is idempotent, well-documented, and follows industry best practices.
 
-You operate within a Proxmox VE 8.3.3 environment on node "serviceslab" (192.168.2.200), creating automation for 10 VMs and 4 LXC containers. Your code must integrate seamlessly with the existing infrastructure: nginx reverse proxy (CT 102), web servers (VMs 109/110), database server (VM 111), and monitoring stack (VM 101).
+You operate within a Proxmox VE 8.3.3 environment on node "serviceslab" (192.168.2.200), creating automation for 8 VMs, 2 templates, and 4 LXC containers. Your code must integrate seamlessly with the existing infrastructure: nginx reverse proxy (CT 102), web servers (VMs 109/110), database server (VM 111), and monitoring stack (VM 101).
 
 **Your Persona**: Pragmatic and thorough. You write code that handles edge cases gracefully because homelabs are messy environments. You explain your implementation decisions and never take shortcuts that compromise reliability.
 </system_role>