feat: implement 4 major features (#461, #462, #463, #464)

[dimka90]

Summary

Single PR implementing 4 issues assigned to dimka90.

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Issue #461: Frontend — Multi-Step Payment Flow Wizard

Files:

• frontend/app/[locale]/payments/create/page.tsx - Wizard route
• frontend/src/components/payments/wizard/WizardContainer.tsx - Step container with progress indicator
• frontend/src/components/payments/wizard/steps/SelectTypeStep.tsx - Payment type selection
• frontend/src/components/payments/wizard/steps/ConfigureStep.tsx - Dynamic per-type form with Zod validation
• frontend/src/components/payments/wizard/steps/ReviewStep.tsx - Summary/review before confirmation
• frontend/src/components/payments/wizard/steps/ConfirmStep.tsx - Processing/success/error states
• frontend/store/wizard-store.ts - Zustand store with localStorage persistence

Accepts: Simple, escrow, subscription, batch payment types; step-by-step flow with progress saved across sessions; real-time validation per step.

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Issue #462: Backend — Custom Webhook Event Filtering & Subscription Manager

Files:

• backend/prisma/schema.prisma - WebhookSubscription, WebhookSubscriptionDelivery models
• backend/src/services/webhooks/subscription-manager.ts - CRUD, pause/resume, testing, metrics, version history
• backend/src/services/webhooks/event-matcher.ts - JSONPath filtering, delivery dedup, overlapping subscriptions
• frontend/app/[locale]/dashboard/developers/webhooks/subscriptions/page.tsx - Subscription management UI
• frontend/lib/api.ts - Subscription API types and methods

Accepts: Multiple subscriptions per merchant; filter by event type, JSONPath conditions; route to different endpoints; pause/resume; delivery metrics; subscription testing.

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Issue #463: Core — Smart Contract-Driven Revenue Sharing Pool

Files:

• contracts/evm/contracts/RevenuePool.sol - EVM revenue pool with configurable split ratios, auto-distribution, claim mechanism
• contracts/soroban/revenue-pool/Cargo.toml - Soroban revenue pool package
• contracts/soroban/revenue-pool/src/lib.rs - Soroban revenue pool contract
• backend/prisma/schema.prisma - RevenuePool, RevenueRecipient, RevenueDistribution models
• backend/src/services/revenue-pool/index.ts - CRUD, recipient management, balance tracking, distribution history
• frontend/lib/api.ts - Revenue pool API types
• frontend/app/[locale]/dashboard/developers/revenue-pools/page.tsx - Pool configuration UI

Accepts: Both Soroban and EVM contracts; configurable split ratios; add/remove recipients via admin; auto-distribution; minimum threshold; claim mechanism; events.

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Issue #464: Contract — EVM Paymaster with ERC-4337 Account Abstraction

Files:

• contracts/evm/contracts/ERC4337Paymaster.sol - ERC-4337 compatible paymaster (IPaymaster interface for EntryPoint v0.7)
• backend/prisma/schema.prisma - PaymasterBudget, UserOperation models
• backend/src/services/account-abstraction/index.ts - Bundler integration, gas estimation, budget management
• frontend/lib/api.ts - Paymaster API types and methods
• frontend/app/[locale]/dashboard/developers/paymaster/page.tsx - Budget management & operations dashboard

Accepts: Verification paymaster (pre-signed sponsorship) and deposit paymaster (pre-funded) modes; batched user operations; session keys; gas estimation with paymaster sponsorship; budget management dashboard.

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Closes: #461
Closes: #462
Closes: #463
Closes: #464

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