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/constants/index.ts

@@ -2,6 +2,8 @@
  * Shared constants for Pezkuwi Web App Projects
  */
 
+import type { TokenInfo } from '../types/tokens';
+
 /**
  * Application version
  */
@@ -32,3 +34,51 @@ export const TIMEOUTS = {
   BLOCKCHAIN_QUERY: 60000,
   TRANSACTION: 120000,
 } as const;
+
+/**
+ * Kurdistan color palette
+ */
+export const KURDISTAN_COLORS = {
+  kesk: '#00A94F', // Green (Kesk)
+  sor: '#EE2A35',  // Red (Sor)
+  zer: '#FFD700',  // Yellow/Gold (Zer)
+  spi: '#FFFFFF',  // White (Spî)
+  res: '#000000',  // Black (Reş)
+} as const;
+
+/**
+ * Known tokens on the Pezkuwi blockchain
+ */
+export const KNOWN_TOKENS: Record<number, TokenInfo> = {
+  0: {
+    id: 0,
+    symbol: 'wHEZ',
+    name: 'Wrapped HEZ',
+    decimals: 12,
+    logo: '🟡',
+  },
+  1: {
+    id: 1,
+    symbol: 'PEZ',
+    name: 'Pezkuwi Token',
+    decimals: 12,
+    logo: '🟣',
+  },
+  2: {
+    id: 2,
+    symbol: 'wUSDT',
+    name: 'Wrapped USDT',
+    decimals: 6,
+    logo: '💵',
+  },
+};
+
+/**
+ * Display token symbols (what users see vs. blockchain IDs)
+ * Example: Users see "USDT" but it's wUSDT (asset ID 2) on blockchain
+ */
+export const TOKEN_DISPLAY_SYMBOLS: Record<string, string> = {
+  'wHEZ': 'HEZ',   // Display HEZ instead of wHEZ
+  'wUSDT': 'USDT', // Display USDT instead of wUSDT
+  'PEZ': 'PEZ',    // PEZ stays as is
+};