Restructure docs: archive VLAN migration, update IPs to VLAN 10

Major documentation cleanup after VLAN migration completion:
- Archive 12 VLAN project docs to archive/vlan-migration/
- Archive 5 done WIP docs (VLAN proposals, AI stack, Fossorial, DNS backup)
- Create standing reference docs 08-DNS-ARCHITECTURE and 09-TAILSCALE-VPN
- Renumber docs to clean 01-09 sequence with merged CHANGELOG
- Update all active docs from stale 192.168.31.x to current VLAN 10 IPs
- Fix CSS1 (.10.9→.10.3) and ZX1 (.10.7→.10.4) IPs in hardware inventory
- Clean 06-VLAN-DEVICE-ASSIGNMENT: remove migration columns/sections, fix VLAN 25 subnet

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -49,12 +49,16 @@ infrastructure/
 └── docs/
     ├── 01-NETWORK-MAP.md             # Network topology
     ├── 02-SERVICES-CRITICAL.md       # P0/P1 services (DNS, Auth, Proxy)
-    ├── 02-PORT-UTILIZATION.md        # Device port assignments
     ├── 03-SERVICES-OTHER.md          # Non-critical services
-    ├── 03-VLAN-DEVICE-ASSIGNMENT.md  # VLAN device mapping
     ├── 04-HARDWARE-INVENTORY.md      # Hardware list
-    ├── 06-CHANGELOG.md               # Change history
-    ├── archive/                      # Completed phase docs
+    ├── 05-PORT-UTILIZATION.md        # Device port assignments
+    ├── 06-VLAN-DEVICE-ASSIGNMENT.md  # VLAN device mapping
+    ├── 07-WIFI-CAPSMAN-CONFIG.md     # WiFi and CAPsMAN settings
+    ├── 08-DNS-ARCHITECTURE.md        # DNS failover architecture
+    ├── 09-TAILSCALE-VPN.md           # Tailscale VPN setup
+    ├── CHANGELOG.md                  # Change history
+    ├── archive/                      # Completed/legacy docs
+    │   └── vlan-migration/           # VLAN migration project artifacts
     ├── incidents/                    # Incident reports
     └── wip/                          # Work in progress
 ```
@@ -93,7 +97,7 @@ cd /tmp && \
    git push
    ```
 
-### Changelog Format (docs/06-CHANGELOG.md)
+### Changelog Format (docs/CHANGELOG.md)
 ```markdown
 ## YYYY-MM-DD
 - [PHASE X] Task description - COMPLETED/FIXED/ISSUE