Add Cliproxy traffic proxy skill with HTTP and SOCKS5 command workflows

cliproxy-traffic-proxy/references/iso-country-examples.md

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+# ISO Country Examples
+
+Use ISO 3166-1 alpha-2 uppercase country codes after `region-`.
+
+Common examples:
+
+- `JP` = Japan
+- `VN` = Vietnam
+- `US` = United States
+- `SG` = Singapore
+- `HK` = Hong Kong
+- `KR` = South Korea
+- `DE` = Germany
+- `FR` = France
+- `GB` = United Kingdom
+- `CA` = Canada
+- `AU` = Australia
+- `IN` = India
+- `BR` = Brazil
+- `MX` = Mexico
+
+Example account snippets:
+
+- `test123456-region-US`
+- `test123456-region-SG-t-15`
+- `test123456-region-US-st-Louisiana-sid-e6CXdJDm-t-15`