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/types/index.ts

@@ -8,4 +8,7 @@
 // Export blockchain-related types here
 export * from './blockchain';
 
+// Export token-related types
+export * from './tokens';
+
 // Add more type exports as needed

shared/types/tokens.ts

@@ -0,0 +1,90 @@
+/**
+ * Token-related type definitions
+ */
+
+export interface TokenInfo {
+  id: number;
+  symbol: string;
+  name: string;
+  decimals: number;
+  logo?: string;
+}
+
+export interface PoolInfo {
+  id: string; // asset1-asset2 pair
+  asset1: number;
+  asset2: number;
+  asset1Symbol: string;
+  asset2Symbol: string;
+  asset1Decimals: number;
+  asset2Decimals: number;
+  reserve1: string; // Raw balance string
+  reserve2: string;
+  lpTokenSupply: string;
+  volume24h?: string;
+  tvl?: string;
+  apr7d?: string;
+  feeRate?: string;
+}
+
+export interface UserLiquidityPosition {
+  poolId: string;
+  asset1: number;
+  asset2: number;
+  lpTokenBalance: string;
+  shareOfPool: string; // Percentage as string (e.g., "2.5")
+  asset1Amount: string;
+  asset2Amount: string;
+  valueUSD?: string;
+  feesEarned?: string;
+}
+
+export interface SwapQuote {
+  amountIn: string;
+  amountOut: string;
+  path: number[]; // Asset IDs in route
+  priceImpact: string; // Percentage as string
+  minimumReceived: string; // After slippage
+  route: string; // Human readable (e.g., "wHEZ → PEZ → wUSDT")
+}
+
+export interface AddLiquidityParams {
+  asset1: number;
+  asset2: number;
+  amount1: string;
+  amount2: string;
+  amount1Min: string;
+  amount2Min: string;
+  recipient: string;
+}
+
+export interface RemoveLiquidityParams {
+  asset1: number;
+  asset2: number;
+  lpTokenAmount: string;
+  amount1Min: string;
+  amount2Min: string;
+  recipient: string;
+}
+
+export interface SwapParams {
+  path: number[];
+  amountIn: string;
+  amountOutMin: string;
+  recipient: string;
+  deadline?: number;
+}
+
+export interface PoolCreationParams {
+  asset1: number;
+  asset2: number;
+  feeRate?: number;
+}
+
+// Transaction status
+export enum TransactionStatus {
+  IDLE = 'idle',
+  PENDING = 'pending',
+  SUCCESS = 'success',
+  ERROR = 'error',
+}