feat: implement risk drift detector, APY dispersion explorer, stress matrix, and strategy candidate queue

[aadviksinghdebug]

Closes #382 - User Risk Preference Drift Detector
Closes #380 - APY Dispersion Explorer Across Providers
Closes #381 - Dynamic Strategy Guardrail Stress Matrix
Closes #364 - Strategy Candidate Queue Prioritization System"

Issue #382 - User Risk Preference Drift Detector:

• Detect when portfolio behavior drifts from stated risk preference (conservative/balanced/aggressive)
• Three drift dimensions: concentration, volatility, and liquidity
• Each preference has defined thresholds (e.g., conservative: max 25% concentration, max 8% volatility, min $500k liquidity)
• Early return for empty portfolios (no drift)
• Dashboard indicator component showing per-dimension drift status with visual warnings
• 12 tests covering all preference profiles and edge cases
  Issue APY Dispersion Explorer Across Providers #380 - APY Dispersion Explorer Across Providers:
• Compute full statistical dispersion (mean, median, range, variance, std dev, CV) from multiple provider APY inputs
• Classify dispersion into low/moderate/high/critical levels with configurable CV thresholds
• Generate confidence signals (high/reduced/low/warning) based on dispersion + provider count
• Per-source deviation from mean for transparency
• Warning messages at moderate/high/critical levels
• Dashboard panel component showing statistics, per-source breakdown, and confidence signal
• 10 tests covering low/high/critical dispersion, empty inputs, config updates
  Issue Dynamic Strategy Guardrail Stress Matrix #381 - Dynamic Strategy Guardrail Stress Matrix:
• Six predefined stress scenarios: liquidity-crisis, oracle-manipulation, trust-collapse, confidence-crisis, multi-factor-meltdown, mild-downturn
• Stress factors (liquidity, trust, confidence, oracle) mapped to guardrail context (concentration, slippage, liquidity, market pause)
• Evaluates all enabled guardrails under each scenario
• Reports per-scenario activation summary with pass rate and status
• Global matrix summary with most-triggered guardrails
• Supports custom scenario add/remove and config updates
• Deep copies scenario data to prevent shared mutable state
• 12 tests covering scenario management, guardrail activation, and accuracy
  Issue Strategy Candidate Queue Prioritization System #364 - Strategy Candidate Queue Prioritization System:
• Rank candidates using weighted scoring: expected upside (40%), confidence (35%), urgency (25%)
• Configurable weights, max queue size, and minimum priority threshold
• Starvation prevention: urgency score boosted for candidates waiting beyond TTL
• Low-quality candidates rejected when queue is full (evicts lowest priority)
• Duplicate detection (by ID) prevents re-enqueue
• Approval pipeline: next-for-processing, approve, reject with reasons
• Qualification gate (minimum score 6) filters low-quality candidates
• Queue state tracking: enqueued/processed counts, wait times, starvation count
• 18 tests covering ordering, starvation prevention, approval pipeline, deduplication
  Infrastructure:
• REST routes at /api/risk (drift, dispersion, stress-matrix) and /api/queue (candidates)
• All routes registered in server/src/app.ts
• 52 tests total passing across all 4 services
• Zero lint errors in new files
• Advisory-only drift detection (no auto-action), read-only stress analysis, queue prioritization preserves safety evaluations"

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[edehvictor]

@aadviksinghdebug Kindly resolve conflict

[edehvictor]

@aadviksinghdebug Kindly resolve conflcit