Organize shared code across web, mobile, and SDK UI projects

Centralized common code into shared/ folder to eliminate duplication and
improve maintainability across all three frontend projects (web, mobile,
pezkuwi-sdk-ui).

Changes:
- Added token types and constants to shared/types/tokens.ts
  - TokenInfo, PoolInfo, SwapQuote, and other DEX types
  - KNOWN_TOKENS with HEZ, PEZ, wUSDT definitions
  - Token logos (🟡🟣💵)

- Added Kurdistan color palette to shared/constants/
  - Kesk, Sor, Zer, Spî, Reş color definitions

- Added TOKEN_DISPLAY_SYMBOLS mapping (USDT vs wUSDT)

- Updated blockchain configuration in shared/blockchain/polkadot.ts
  - Added beta testnet endpoint (wss://beta-rpc.pezkuwi.art)
  - Defined DEFAULT_ENDPOINT constant

- Moved i18n to shared/i18n/
  - Centralized translation files for 6 languages (EN, TR, KMR, CKB, AR, FA)
  - Added LANGUAGES configuration with RTL support
  - Created isRTL() helper function

- Updated web and mobile to import from shared
  - web/src/types/dex.ts now re-exports from shared
  - web/src/contexts/PolkadotContext.tsx uses DEFAULT_ENDPOINT
  - mobile/src/i18n/index.ts uses shared translations
  - mobile/src/contexts/PolkadotContext.tsx uses DEFAULT_ENDPOINT

- Updated shared/README.md with comprehensive documentation

This architecture reduces code duplication and ensures consistency across
all frontend projects.

mobile/src/contexts/PolkadotContext.tsx

@@ -4,6 +4,7 @@ import { Keyring } from '@polkadot/keyring';
 import { KeyringPair } from '@polkadot/keyring/types';
 import AsyncStorage from '@react-native-async-storage/async-storage';
 import { cryptoWaitReady } from '@polkadot/util-crypto';
+import { DEFAULT_ENDPOINT } from '../../../shared/blockchain/polkadot';
 
 interface Account {
   address: string;
@@ -39,7 +40,7 @@ interface PolkadotProviderProps {
 
 export const PolkadotProvider: React.FC<PolkadotProviderProps> = ({
   children,
-  endpoint = 'wss://beta-rpc.pezkuwi.art', // Beta testnet RPC
+  endpoint = DEFAULT_ENDPOINT, // Beta testnet RPC from shared config
 }) => {
   const [api, setApi] = useState<ApiPromise | null>(null);
   const [isApiReady, setIsApiReady] = useState(false);

mobile/src/i18n/index.ts

@@ -2,31 +2,25 @@ import i18n from 'i18next';
 import { initReactI18next } from 'react-i18next';
 import AsyncStorage from '@react-native-async-storage/async-storage';
 
-// Import all translations
-import en from './locales/en.json';
-import tr from './locales/tr.json';
-import kmr from './locales/kmr.json';
-import ckb from './locales/ckb.json';
-import ar from './locales/ar.json';
-import fa from './locales/fa.json';
+// Import shared translations and language configurations
+import {
+  translations,
+  LANGUAGES,
+  DEFAULT_LANGUAGE,
+  LANGUAGE_STORAGE_KEY,
+  isRTL as checkIsRTL,
+} from '../../../shared/i18n';
 
-// Language storage key
-export const LANGUAGE_KEY = '@pezkuwi_language';
+// Language storage key (re-export for compatibility)
+export const LANGUAGE_KEY = LANGUAGE_STORAGE_KEY;
 
-// Available languages
-export const languages = [
-  { code: 'en', name: 'English', nativeName: 'English', rtl: false },
-  { code: 'tr', name: 'Turkish', nativeName: 'Türkçe', rtl: false },
-  { code: 'kmr', name: 'Kurdish (Kurmanji)', nativeName: 'Kurmancî', rtl: false },
-  { code: 'ckb', name: 'Kurdish (Sorani)', nativeName: 'سۆرانی', rtl: true },
-  { code: 'ar', name: 'Arabic', nativeName: 'العربية', rtl: true },
-  { code: 'fa', name: 'Persian', nativeName: 'فارسی', rtl: true },
-];
+// Available languages (re-export for compatibility)
+export const languages = LANGUAGES;
 
 // Initialize i18n
 const initializeI18n = async () => {
   // Try to get saved language
-  let savedLanguage = 'en'; // Default fallback
+  let savedLanguage = DEFAULT_LANGUAGE;
   try {
     const stored = await AsyncStorage.getItem(LANGUAGE_KEY);
     if (stored) {
@@ -40,15 +34,15 @@ const initializeI18n = async () => {
     .use(initReactI18next)
     .init({
       resources: {
-        en: { translation: en },
-        tr: { translation: tr },
-        kmr: { translation: kmr },
-        ckb: { translation: ckb },
-        ar: { translation: ar },
-        fa: { translation: fa },
+        en: { translation: translations.en },
+        tr: { translation: translations.tr },
+        kmr: { translation: translations.kmr },
+        ckb: { translation: translations.ckb },
+        ar: { translation: translations.ar },
+        fa: { translation: translations.fa },
       },
       lng: savedLanguage,
-      fallbackLng: 'en',
+      fallbackLng: DEFAULT_LANGUAGE,
       compatibilityJSON: 'v3',
       interpolation: {
         escapeValue: false,
@@ -74,8 +68,7 @@ export const getCurrentLanguage = () => i18n.language;
 // Check if language is RTL
 export const isRTL = (languageCode?: string) => {
   const code = languageCode || i18n.language;
-  const lang = languages.find(l => l.code === code);
-  return lang?.rtl || false;
+  return checkIsRTL(code);
 };
 
 export { initializeI18n };