Implement cross-chain bridge with lock-mint and burn-release patterns

[Smartdevs17]

Description

Build a cross-chain bridge for moving assets between Stellar and EVM chains, using lock-mint (source) and burn-release (destination) patterns with validator consensus.

Acceptance Criteria

• Bridge contract with lock/burn functions
• Validator set with threshold signing
• Mint/release on destination chain after validator confirmation
• Bridge transaction monitoring and proof generation
• Emergency pause per chain
• Bridge analytics (volume, fees, active validators)

Technical Scope

• stellar-lend/contracts/bridge/src/
• stellar-lend/contracts/hello-world/src/bridge.rs
• stellar-lend/contracts/amm/src/
• Edge: validator collusion, reorg safety, bridge drain detection, wrapped token naming