add first commit

workers/example/subtract.toml

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+# subtract 接口
+
+[GET]
+summary = "Subtract two numbers"
+docstring = "Subtract two numbers via GET query params (a - b)"
+params = ["a: float", "b: float"]
+
+[GET.response_model]
+result = { type = "float", required = true }
+operation = { type = "str", default = "subtract" }
+timestamp = { type = "float", required = false, default = 0.0 }