docs(theme): align palette references with the updated Green and Brown steps

Replace the old Green Default #123328 and Dark steps in the component docs,
brand color steps, runtime theme contract, token guide, loading screen doc and
the @hm-design/ui AI design rules. check:ai-docs passes. Remaining references
elsewhere are left for the final documentation consistency pass.

packages/ui/ai/DESIGN_RULES.md

@@ -11,8 +11,8 @@
 
 | 역할 | 값 | 변수 |
 |---|---|---|
-| Green(주색) | `#123328` | `--hm-sem-palette-green-default` |
-| Green 진한 글자 | `#0A221D` | `--hm-sem-palette-green-dark-1` |
+| Green(주색) | `#164434` | `--hm-sem-palette-green-default` |
+| Green 진한 글자 | `#11372D` | `--hm-sem-palette-green-dark-1` |
 | Green Focus·Active | `#266651` | `--hm-sem-palette-green-light-2` |
 | Green Tint(강조 면) | `#BDDFD4` | `--hm-sem-palette-green-tint` |
 | Beige(콘텐츠 면) | `#F5F0E5` | `--hm-sem-palette-beige-light` |