feat: implement service management module including UI, services, and navigation screens

src/constants/theme.ts

@@ -1,6 +1,7 @@
 export const THEME = {
   colors: {
     primary: '#1E3A8A',
+    primaryDark: '#172554',
     primaryLight: '#E0E7FF',
     primaryLighter: '#EEF2FF',
     background: '#F9FAFB',
@@ -12,6 +13,7 @@ export const THEME = {
     },
     border: '#F3F4F6',
     warning: '#EAB308',
+    error: '#EF4444',
   },
   spacing: {
     xs: 4,