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

package.json

@@ -0,0 +1,40 @@
+{
+  "name": "jortt-mcp",
+  "version": "0.1.0",
+  "description": "Model Context Protocol server for the Jortt accounting API",
+  "license": "MIT",
+  "type": "module",
+  "bin": {
+    "jortt-mcp": "dist/index.js"
+  },
+  "files": [
+    "dist",
+    "README.md"
+  ],
+  "scripts": {
+    "fetch-spec": "node scripts/fetch-spec.mjs",
+    "build": "npm run fetch-spec && tsc && node -e \"require('fs').copyFileSync('src/openapi.json','dist/openapi.json')\"",
+    "prepare": "npm run build",
+    "start": "node dist/index.js",
+    "dev": "tsc --watch",
+    "typecheck": "tsc --noEmit"
+  },
+  "keywords": [
+    "mcp",
+    "model-context-protocol",
+    "jortt",
+    "accounting",
+    "invoicing",
+    "api"
+  ],
+  "engines": {
+    "node": ">=18"
+  },
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.12.0"
+  },
+  "devDependencies": {
+    "@types/node": "^22.10.0",
+    "typescript": "^5.7.0"
+  }
+}