feat: index.html 디자인 테마 색상 추가

- 다크 테마 색상 (배경, 카드, 텍스트, 강조색)
- 라이트 테마 색상
- HOT/게시판 배지 색상

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

app/src/main/java/com/hotdeal/alarm/ui/theme/Theme.kt

@@ -71,6 +71,50 @@ private val DarkOnErrorContainer = Color(0xFFFFDAD6)
 private val DarkOutline = Color(0xFF938F99)
 private val DarkOutlineVariant = Color(0xFF49454F)
 
+// =========================
+// index.html Inspired Colors
+// =========================
+
+// Dark Theme (index.html style)
+val IndexBgPrimary = Color(0xFF0f0f1a)
+val IndexBgSecondary = Color(0xFF1a1a2e)
+val IndexBgCard = Color(0xFF16162a)
+val IndexBgCardHover = Color(0xFF1e1e3a)
+val IndexBgInput = Color(0xFF252545)
+
+val IndexTextPrimary = Color(0xFFffffff)
+val IndexTextSecondary = Color(0xFFa0a0b8)
+val IndexTextMuted = Color(0xFF6b6b8a)
+
+val IndexAccentPrimary = Color(0xFF6366f1)
+val IndexAccentSecondary = Color(0xFF8b5cf6)
+
+val IndexHotBadgeBg = Color(0x26EF4444) // rgba(239, 68, 68, 0.15)
+val IndexHotBadgeText = Color(0xFFef4444)
+
+val IndexBoardBadgeBg = Color(0x26818CF8) // rgba(129, 140, 248, 0.15)
+val IndexBoardBadgeText = Color(0xFF818cf8)
+
+// Light Theme (index.html style)
+val IndexLightBgPrimary = Color(0xFFf8fafc)
+val IndexLightBgSecondary = Color(0xFFffffff)
+val IndexLightBgCard = Color(0xFFffffff)
+val IndexLightBgCardHover = Color(0xFFf1f5f9)
+val IndexLightBgInput = Color(0xFFf1f5f9)
+
+val IndexLightTextPrimary = Color(0xFF0f172a)
+val IndexLightTextSecondary = Color(0xFF475569)
+val IndexLightTextMuted = Color(0xFF94a3b8)
+
+val IndexLightAccentPrimary = Color(0xFF4f46e5)
+val IndexLightAccentSecondary = Color(0xFF7c3aed)
+
+val IndexLightHotBadgeBg = Color(0x1ADC2626) // rgba(220, 38, 38, 0.1)
+val IndexLightHotBadgeText = Color(0xFFdc2626)
+
+val IndexLightBoardBadgeBg = Color(0x1A4F46E5) // rgba(79, 70, 229, 0.1)
+val IndexLightBoardBadgeText = Color(0xFF4f46e5)
+
 // Site Colors
 val PpomppuColor = Color(0xFFE91E63)
 val ClienColor = Color(0xFF4CAF50)