Add Jortt API MCP server

Model Context Protocol server that exposes the full Jortt accounting API
as MCP tools, generated from Jortt's OpenAPI specification.

- OAuth 2.0 client-credentials auth with token caching and 401 refresh
- 82 tools covering customers, invoices, estimates, expenses, projects,
  bank accounts, reports, labels, ledger accounts and payroll
- Spec fetched at build time (with a runtime fetch fallback), so new API
  operations become new tools automatically with no code changes
- Path/query/body parameters handled automatically; request bodies passed
  under a single `body` argument with a resolved JSON Schema
- Readable, stable snake_case tool names derived from method, path and
  operation summary

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016QhaFvGz9gfRg5qDV3ragu

LICENSE

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+MIT License
+
+Copyright (c) 2026 deprekated
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.