feat:Implement Stellar Transfer Failure Analyzer

[SheyeJDev]

feat: Stellar failure analyzer & Soroban route ranker

What's changed

Stellar Transfer Failure Analyzer (src/analysis/failures/stellar/)

• Added parseStellarFailure() to map raw Horizon/Soroban error responses to structured ParsedFailure objects
• Resolves failure codes via a 3-tier strategy: extras.result_codes → top-level resultCode → message pattern matching
• Covers all major result codes (tx_bad_seq, tx_no_account, op_underfunded, etc.) and Soroban-specific failures
• Each failure includes a human-readable explanation, recovery recommendation, severity, and retryability flag
• Exposed analyzeStellarFailure() and formatFailureForLog() as the public API via index.ts

Soroban Route Ranker (src/routing/smart/stellar/)

• Added rankSorobanRoutes() to score and rank bridge routes by a composite fee + duration metric
• Uses min-max normalization with configurable weights (default 50/50); weights are auto-normalized if they don't sum to 1
• Exposes getTopSorobanRoutes() as a convenience wrapper for returning the top N routes
• Each ranked route includes a full score breakdown (normalizedFee, normalizedDuration, weightedScore)

Closes #308
Closes #309

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