Add crypto analysis use-cases tool

[tspenov]

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Ticket

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have tried to find clearer solution before commenting hard-to-understand parts of code
• I have added tests that prove my fix is effective or that my feature works

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Note

Adds a Use Cases Catalog and MCP tool that returns step-by-step analytical recipes (starting with Identify Market Tops) and registers it with tests.

• Backend / MCP:
  • Use Cases Catalog: Introduces Sanbase.MCP.UseCasesCatalog with identify_market_tops including detailed steps and interpretation.
  • New Tool: Adds Sanbase.MCP.UseCasesCatalogTool to return a simplified list of use cases (title, steps, interpretation).
  • Server Registration: Registers Sanbase.MCP.UseCasesCatalogTool in lib/sanbase/mcp/server.ex.
• Tests:
  • Validates catalog structure/content and ensures steps reference tools.
  • Verifies tool response shape and fields (only title, steps, interpretation).

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[tspenov]

@cursor review

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✅ Bugbot reviewed your changes and found no bugs!

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