feat: AI integration for network optimization, smart contract security, and anomaly detection (#623, #557, #533)

[temitope-007]

This PR integrates three major AI features into the Stellar Dev Dashboard:

1. AI-Enhanced Network Optimization: Introduces NetworkOptimizer to handle request batching, prioritization, and adaptive quality based on simulated network conditions. Integrated into networkMonitoring.js.
2. AI-Powered Smart Contract Security Analysis: Introduces ContractSecurityAnalyzer to scan Soroban contracts for vulnerabilities using static analysis patterns and simulated ML detections. Integrated into contractRecommendations.js.
3. Real-Time Anomaly Detection for Account Activity: Introduces AnomalyDetectionPipeline using Isolation Forest to assign anomaly scores to incoming transactions. Integrated into accountWatchSystem.ts.

Closes #623
Closes #557
Closes #533

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