docs: update SKILL.md with connection + update-connection endpoints

feat: add connection string endpoint + update-connection after claim

Add claim flow to SKILL.md and README

Add POST /api/tokens/:token/claim endpoint

Update SKILL.md: document claim_url in quick start

Add TiDB Cloud Zero claim URL support

SKILL.md: add optional encryption key step

SKILL.md: add copy-paste commands for quick start

Revert "Add skill installation & usage guide for claws"

Add skill installation & usage guide for claws

Add time range filtering (from/to params) + fix dedupe

Update README with architecture diagram + encryption docs

Add AES-256-GCM encryption for connection strings + optional client key

Update skill: per-token Zero isolation docs

Per-token TiDB Cloud Zero isolation + CREATE DATABASE on provision