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.

shared/i18n/locales/fa.json

@@ -0,0 +1,64 @@
+{
+  "welcome": {
+    "title": "به پێزکووی خوش آمدید",
+    "subtitle": "دروازه شما به حکمرانی غیرمتمرکز",
+    "selectLanguage": "زبان خود را انتخاب کنید",
+    "continue": "ادامه"
+  },
+  "auth": {
+    "signIn": "ورود",
+    "signUp": "ثبت نام",
+    "email": "ایمیل",
+    "password": "رمز عبور",
+    "confirmPassword": "تأیید رمز عبور",
+    "forgotPassword": "رمز عبور را فراموش کرده‌اید؟",
+    "noAccount": "حساب کاربری ندارید؟",
+    "haveAccount": "قبلاً حساب کاربری دارید؟",
+    "createAccount": "ایجاد حساب",
+    "welcomeBack": "خوش آمدید!",
+    "getStarted": "شروع کنید"
+  },
+  "dashboard": {
+    "title": "داشبورد",
+    "wallet": "کیف پول",
+    "staking": "سپرده‌گذاری",
+    "governance": "حکمرانی",
+    "dex": "صرافی",
+    "history": "تاریخچه",
+    "settings": "تنظیمات",
+    "balance": "موجودی",
+    "totalStaked": "کل سپرده",
+    "rewards": "پاداش‌ها",
+    "activeProposals": "پیشنهادات فعال"
+  },
+  "wallet": {
+    "title": "کیف پول",
+    "connect": "اتصال کیف پول",
+    "disconnect": "قطع اتصال",
+    "address": "آدرس",
+    "balance": "موجودی",
+    "send": "ارسال",
+    "receive": "دریافت",
+    "transaction": "تراکنش",
+    "history": "تاریخچه"
+  },
+  "settings": {
+    "title": "تنظیمات",
+    "language": "زبان",
+    "theme": "تم",
+    "notifications": "اعلان‌ها",
+    "security": "امنیت",
+    "about": "درباره",
+    "logout": "خروج"
+  },
+  "common": {
+    "cancel": "لغو",
+    "confirm": "تأیید",
+    "save": "ذخیره",
+    "loading": "در حال بارگذاری...",
+    "error": "خطا",
+    "success": "موفق",
+    "retry": "تلاش مجدد",
+    "close": "بستن"
+  }
+}