Fix YAML parsing of IPv6 addresses in docker-compose examples

Colons in IPv6 addresses (IP6_SUBNET, PEERDNS) are interpreted as
YAML key-value separators when unquoted, producing the error:

  services.wireguard.environment.[N]: unexpected type map[string]interface {}

Wrap the affected environment entries in double quotes in all four
example blocks (host + bridge in both README.md and readme-vars.yml).

https://claude.ai/code/session_01QdSdYNzFJjZVymw6NNbGP5

Author: claude

README.md

@@ -97,8 +97,8 @@ services:
     environment:
       - PEERS=3
       - SERVERURL=wireguard.domain.com
-      - IP6_SUBNET=2001:db8:b00b:420::
-      - PEERDNS=8.8.8.8,2001:4860:4860::8888
+      - "IP6_SUBNET=2001:db8:b00b:420::"
+      - "PEERDNS=8.8.8.8,2001:4860:4860::8888"
     restart: unless-stopped
 ```
 
@@ -138,8 +138,8 @@ services:
     environment:
       - PEERS=3
       - SERVERURL=wireguard.domain.com
-      - IP6_SUBNET=2001:db8:b00b:420::
-      - PEERDNS=8.8.8.8,2001:4860:4860::8888
+      - "IP6_SUBNET=2001:db8:b00b:420::"
+      - "PEERDNS=8.8.8.8,2001:4860:4860::8888"
     restart: unless-stopped
 networks:
   wireguard_net:

readme-vars.yml

@@ -117,8 +117,8 @@ app_setup_block: |
         environment:
           - PEERS=3
           - SERVERURL=wireguard.domain.com
-          - IP6_SUBNET=2001:db8:b00b:420::
-          - PEERDNS=8.8.8.8,2001:4860:4860::8888
+          - "IP6_SUBNET=2001:db8:b00b:420::"
+          - "PEERDNS=8.8.8.8,2001:4860:4860::8888"
         restart: unless-stopped
     ```
 
@@ -158,8 +158,8 @@ app_setup_block: |
         environment:
           - PEERS=3
           - SERVERURL=wireguard.domain.com
-          - IP6_SUBNET=2001:db8:b00b:420::
-          - PEERDNS=8.8.8.8,2001:4860:4860::8888
+          - "IP6_SUBNET=2001:db8:b00b:420::"
+          - "PEERDNS=8.8.8.8,2001:4860:4860::8888"
         restart: unless-stopped
     networks:
       wireguard_net: