Feature/bridge analytics circuit breaker import export websocket

[Mosas2000]

Summary

This PR implements four major features for the StellarLend protocol: cross-chain bridge analytics, tiered circuit breaker system, bulk position import/export, and real-time market data WebSocket streaming.

Issues Addressed

Closes #333 - Implement cross-chain bridge with lock-mint and burn-release patterns
Closes #334 - Add emergency circuit breaker with tiered triggers
Closes #345 - Build import/export system for bulk position management
Closes #346 - Add real-time market data streaming via WebSocket

Changes

Issue #333: Bridge Analytics

File: stellar-lend/contracts/bridge/src/bridge.rs

Added BridgeAnalytics struct for tracking bridge metrics
Implemented get_bridge_analytics() for individual bridge statistics
Implemented get_all_bridge_analytics() for protocol-wide metrics
Tracks: total volume deposited/withdrawn, net volume, fees collected, active validators

Issue #334: Tiered Circuit Breaker

File: stellar-lend/contracts/hello-world/src/circuit_breaker.rs

Tier 1: Single pool pause - triggers on price deviation >20%
Tier 2: All lending paused - triggers on abnormal utilization >95%
Tier 3: Full protocol halt - requires governance vote to unpause
Guardian multisig support for manual triggers
Automatic trigger conditions with configurable thresholds
check_automatic_triggers() for monitoring price deviation and utilization
is_operation_allowed() for tier-aware operation checking

Issue #345: Bulk Position Import/Export

Files:

api/src/utils/positionImportExport.ts
api/src/controllers/positions.controller.ts
api/src/routes/positions.routes.ts
api/src/types/positions.ts
Features:

CSV/JSON import with comprehensive validation
Row-level error reporting with field-specific messages
Export positions in CSV or JSON format with filtering
Template generation for quick start
Import history with rollback capability
Large file processing support
API Endpoints:

Method Endpoint Description

POST /api/positions/import/validate Validate import data
POST /api/positions/import Execute bulk import
POST /api/positions/export Export positions
GET /api/positions/import/template Download template
GET /api/positions/import/history View import history
POST /api/positions/import/:importId/rollback Rollback import
Issue #346: Real-Time Market Data WebSocket
File: api/src/ws/priceWebSocket.ts

Features:

Market data channels: pools, liquidations, rates
Throttled updates (max 1 per second per channel)
Reconnection with state recovery via tokens
Authentication support for private channels
Connection spike handling and rate limiting
Max 20 subscriptions per connection
Public API:

broadcastLiquidation(event) - Push liquidation events
updatePoolData(poolUpdate) - Push pool updates
updateRateData(rateUpdate) - Push rate updates

Files Changed

File Type Lines
api/src/controllers/positions.controller.ts New +198
api/src/middleware/validation.ts Modified +66
api/src/routes/positions.routes.ts New +136
api/src/types/positions.ts New +112
api/src/utils/positionImportExport.ts New +394
api/src/ws/priceWebSocket.ts Modified +363/-35
stellar-lend/contracts/bridge/src/bridge.rs Modified +48
stellar-lend/contracts/hello-world/src/circuit_breaker.rs Modified +320/-5
Total: 1,602 insertions, 35 deletions

Testing Recommendations

Bridge Analytics

Test volume tracking with multiple deposits/withdrawals
Verify fee calculations
Test validator status updates
Circuit Breaker

Test each tier activation/deactivation
Verify automatic trigger conditions (price deviation, utilization)
Test governance vote requirement for Tier 3 unpause
Import/Export

Test CSV parsing with edge cases (quotes, commas, encoding)
Test JSON import with invalid data
Verify large file processing
Test rollback functionality
WebSocket

Test reconnection with state recovery
Verify throttling (max 1 msg/sec per channel)
Test authentication for private channels
Verify cleanup of stale reconnect tokens
Security Considerations
Bridge Analytics: Read-only operations, no security implications
Circuit Breaker: Guardian multisig required for manual triggers; governance vote required for Tier 3 unpause
Import/Export: Validation prevents invalid data; rollback capability for error recovery
WebSocket: Rate limiting prevents abuse; authentication for private channels

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