Release v2.0.0

Changes

• Add MCP v2 support through FastMCP 4.
• Return isError: true for search failures; clients must handle tool errors.
• Add guided inputs for missing search parameters.
• Allow anonymous discovery while requiring API keys for searches.
• Improve resource compatibility and flight dashboard currency formatting.

Merged PRs

• feat: upgrade FastMCP and add guided search inputs by @adarshdigievo in #72
• Directory readiness: anonymous handshake, /.well-known, icon, privacy policy by @zcag in #71

Full Changelog: v1.0.3...v2.0.0