fix: rename environment variables to match MCP server expectations

Gitea MCP server expects:
- GITEA_API_URL (not GITEA_URL) - must include /api/v1
- GITEA_API_TOKEN (not GITEA_TOKEN)

NetBox MCP server expects:
- NETBOX_API_URL (not NETBOX_URL) - must include /api
- NETBOX_API_TOKEN (not NETBOX_TOKEN)

Changes:
- Update all setup commands to use correct variable names
- Update docs/CONFIGURATION.md with correct variables and URL format
- Update scripts/setup.sh templates
- Update CLAUDE.md hybrid configuration reference
- Remove GITEA_ORG from system-level config (it's project-level)
- Fix API URL paths in curl commands (remove redundant /api/v1)

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

plugins/cmdb-assistant/commands/initial-setup.md

@@ -84,8 +84,8 @@ cat > ~/.config/claude/netbox.env << 'EOF'
 # NetBox API Configuration
 # Generated by cmdb-assistant /initial-setup
 
-NETBOX_URL=<USER_PROVIDED_URL>
-NETBOX_TOKEN=PASTE_YOUR_TOKEN_HERE
+NETBOX_API_URL=<USER_PROVIDED_URL>
+NETBOX_API_TOKEN=PASTE_YOUR_TOKEN_HERE
 EOF
 chmod 600 ~/.config/claude/netbox.env
 ```
@@ -120,7 +120,7 @@ Use AskUserQuestion:
 ### Step 4.1: Test Configuration (if token was added)
 
 ```bash
-source ~/.config/claude/netbox.env && curl -s -o /dev/null -w "%{http_code}" -H "Authorization: Token $NETBOX_TOKEN" "$NETBOX_URL/api/"
+source ~/.config/claude/netbox.env && curl -s -o /dev/null -w "%{http_code}" -H "Authorization: Token $NETBOX_API_TOKEN" "$NETBOX_API_URL/api/"
 ```
 
 Report result: