services: add Xquik — X (Twitter) real-time data

[kriptoburak]

Summary

• Add Xquik to the MPP service directory with 7 endpoints for real-time X (Twitter) data
• Endpoints cover tweet lookup, tweet search, user profiles, follower checks, article extraction, media download, and trending topics
• Uses TEMPO_PAYMENT (USDC) with per-request charge and per-item session pricing

Test plan

• node scripts/generate-discovery.ts runs successfully (55 services, 630 endpoints)
• Verify endpoint routes and pricing match Xquik's API
• Confirm discovery.json includes all 7 Xquik endpoints

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