refactor(ui): web/admin amber->main 치환 + theme.ts deprecated 별칭 제거 (WS-AMBER)

- apps/web 11건 + apps/admin 10건 accent.amber->main 치환
- packages/ui/src/theme.ts에서 amber/amberDim/amberGlow @deprecated 별칭 제거
  (본체 main/dim/glow 유지). 전 모노레포 amber 잔여 0건 확인.
SKIP: site/src/tokens.ts(별도 토큰 계통, d3roPalette 비의존)
정책: docs/REFACTOR_POLICY.md DP1, 이식 인사이트 P7

apps/admin/src/components/charts/dau-chart.tsx

@@ -48,9 +48,9 @@ export function DauChart({ data }: DauChartProps): React.ReactElement {
           <Line
             type="monotone"
             dataKey="active_users"
-            stroke={d3roPalette.accent.amber}
+            stroke={d3roPalette.accent.main}
             strokeWidth={2}
-            dot={{ fill: d3roPalette.accent.amber, r: 3 }}
+            dot={{ fill: d3roPalette.accent.main, r: 3 }}
             name="Active Users"
           />
         </LineChart>

apps/admin/src/components/charts/feature-usage-chart.tsx

@@ -28,7 +28,7 @@ interface FeatureUsageChartProps {
 }
 
 const FEATURE_COLORS: Record<string, string> = {
-  llm_haiku: d3roPalette.accent.amber,
+  llm_haiku: d3roPalette.accent.main,
   llm_sonnet: d3roPalette.tag.green,
   llm_opus: d3roPalette.tag.purple,
   stt_transcribe: d3roPalette.tag.blue,

apps/admin/src/components/charts/top-users-chart.tsx

@@ -57,7 +57,7 @@ export function TopUsersChart({ data }: TopUsersChartProps): React.ReactElement
               color: d3roPalette.text.primary,
             }}
           />
-          <Bar dataKey="total" fill={d3roPalette.accent.amber} name="Total Calls" />
+          <Bar dataKey="total" fill={d3roPalette.accent.main} name="Total Calls" />
         </BarChart>
       </ResponsiveContainer>
     </Box>