Add API Trace Viewer, Recipient Verification, Cash Flow Analytics, and Approval Threshold Rules

[dimka90]

Summary

This PR implements four features that enhance debugging, verification, analytics, and transfer governance.

Issue #236 - Add API Request Trace Viewer

• Backend: RequestTraceService captures API request traces with correlation IDs, method, path, status code, timing, and error details. Routes at /admin/traces with filtering by correlation ID, method, status, date range, and pagination.
• Frontend: AdminApiTraces page with stats cards, filterable trace table, expandable rows showing full request/response details, and auto-refresh.

Issue #237 - Add Recipient Verification Badge System

• Backend: VerificationService manages recipient verification status, badge assignment, trust scoring, and verification requests. Endpoints for creating/approving/rejecting verification requests.
• Frontend: VerificationBadge component with tooltip support (verified/trusted/frequent/business/new badges). RecipientVerification admin page with two tabs: verified recipients list and pending verification requests with approve/reject actions.

Issue #238 - Add Cash Flow Analytics Dashboard

• Backend: CashFlowAnalyticsService with demo data generating 90-day daily trends, 6-month summaries, top recipients, and funding sources.
• Frontend: CashFlowAnalytics page with summary cards, monthly bar chart (inflow vs outflow), 30-day net flow trend area chart, pie chart of funding sources, top recipients list, and monthly breakdown table.

Issue #239 - Add Transfer Approval Threshold Rules

• Backend: ApprovalThresholdService with configurable rules engine supporting conditions (amount_above, amount_below, amount_range, destination_country, risk_score, user_tier, daily_volume) and actions (allow, require_approval, require_second_approval, require_compliance_review, block). Full CRUD + toggle endpoints.
• Frontend: AdminThresholdRules page with approval levels overview, rules list with enable/disable toggle, edit/delete actions, and a create/edit dialog with form fields for all rule properties.

Files Changed

Backend (new):

• backend/src/modules/traces/requestTraceService.ts
• backend/src/routes/traces.ts
• backend/src/modules/verification/verificationService.ts
• backend/src/routes/verification.ts
• backend/src/modules/analytics/cashFlowAnalyticsService.ts
• backend/src/routes/analytics.ts
• backend/src/modules/approvals/approvalThresholdService.ts
• backend/src/routes/thresholds.ts

Backend (modified):

• backend/src/container.ts - register 4 new services
• backend/src/app.ts - register 4 new route modules

Frontend (new):

• src/pages/AdminApiTraces.tsx
• src/components/VerificationBadge.tsx
• src/pages/RecipientVerification.tsx
• src/pages/CashFlowAnalytics.tsx
• src/pages/AdminThresholdRules.tsx

Frontend (modified):

• src/App.tsx - add routes for new pages
• src/pages/AdminDashboard.tsx - add links to new admin pages

closes #236
closes #237
closes #238
closes #239

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