Add ScriptMasterLabs MCP servers to finance--crypto (5 servers)

[Timwal78]

Adding 5 production MCP servers from ScriptMasterLabs (@Timwal78), Service-Disabled Veteran SDVOSB:

• SqueezeOS — 33-tool institutional trading MCP, x402/XRPL/RLUSD
• sml-x402-signal-api — Pay-per-call US equities signals, $0.01–$0.25
• aetheris-mcp-render — x402 web scraper, USDC on Base
• ghost-layer — Dual-chain XRPL/Base toll gateway, MCP at ghost-layer.onrender.com/mcp
• zeroquery-protocol — Proof-of-Intent for AI agent identity

[wilsonccccc]

Thanks for the submission. This PR currently adds five entries at once, and not all of them include a usable MCP install/connection path. Please split or trim this to actual MCP servers only, and include concrete endpoint/install/auth details for each entry. For protocol/API-only projects, add evidence that they expose an MCP server before listing them here.