Fix/price candles webhook dispatch readme env

[levi0005]

Summary

Related issue

Closes #365
closes #366
closes #367
closes #368
FILES CHANGED:

• apps/api/src/price/price.controller.spec.ts
• apps/api/src/webhooks/webhook.processor.spec.ts (new)
• README.md
• apps/web/.env.example

---

What was implemented:

1. Price controller spec against real candles (price.controller.spec.ts): The mockCandle fixture was misaligned with the actual PriceCandle interface exported by price.service.ts. It used timestamp (wrong field name) and string OHLCV values — but the real interface uses time: number and numeric open/high/low/close/volume. Fixed to match exactly: { time: 1700000000, open: 0.09, high: 0.11, low: 0.08, close: 0.1, volume: 50000 }.

2. Webhooks dispatch integration test (webhook.processor.spec.ts): Created a new spec covering the full WebhookWorker dispatch pipeline — both the queue-enqueue layer (dispatch()) and the HTTP-delivery layer (deliver()). Tests cover: correct job options (3 attempts, exponential backoff), HMAC-SHA256 signature attachment when a secret is set, delivery log recording, consecutiveFails increment/reset logic, auto-disable after 10 consecutive failures, and graceful handling of network errors (ECONNREFUSED → undefined status). Worker is instantiated directly (bypassing onModuleInit) to avoid real Redis/BullMQ connections in CI.

3. Fix README org links to vatix-protocol (README.md): Two GitHub URLs in the README pointed at the old Valreb001 org. Both updated to vatix-protocol: the git clone command and the "good first issue" label filter link.

4. Add STELLAR_RPC_URL to web .env.example (apps/web/.env.example): The API's .env.example already had STELLAR_RPC_URL, but the web app's .env.example was missing it. Added NEXT_PUBLIC_STELLAR_RPC_URL=https://soroban-testnet.stellar.org so the SDK can reach Soroban RPC directly from the browser.

Type of change

• Bug fix
• New feature
• Docs update
• Chore / refactor

Checklist

• CI passes (lint + tests + build)
• Self-reviewed the diff
• Added or updated tests where relevant
• Docs updated if needed