feat: add pytest testing infrastructure

- Add test optional dependencies to pyproject.toml
- Add conftest.py with fixtures for mocking settings and MCP client
- Add test_server.py with tests for tryton_call and MCP tools

uv.lock

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 [[package]]
 name = "python-dateutil"
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 [[package]]
-name = "trytonmcp"
+name = "tryton-mcp"
 version = "0.1.0"
 source = { virtual = "." }
 dependencies = [
     { name = "fastmcp", extra = ["tasks"] },
+    { name = "python-dotenv" },
     { name = "sabatron-tryton-rpc-client" },
 ]
 
+[package.optional-dependencies]
+test = [
+    { name = "pytest" },
+    { name = "pytest-mock" },
+]
+
 [package.metadata]
 requires-dist = [
     { name = "fastmcp", extras = ["tasks"], specifier = ">=3.1.0" },
+    { name = "pytest", marker = "extra == 'test'", specifier = ">=8.0.0" },
+    { name = "pytest-mock", marker = "extra == 'test'", specifier = ">=3.14.0" },
+    { name = "python-dotenv", specifier = ">=1.0.0" },
     { name = "sabatron-tryton-rpc-client", specifier = ">=7.4.0" },
 ]
+provides-extras = ["test"]
 
 [[package]]
 name = "typer"