add first commit

workers/doubao/analyze.toml

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+[POST]
+summary = "分析图片内容"
+docstring = "发送图片（base64或路径）到豆包视觉模型，返回描述"
+params = [
+    "image_base64: str",
+    "prompt: str"
+]
+response_model = { result = { type = "str", required = true }, error = { type = "str", required = false, default = "" } }

workers/doubao/config.toml

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+[worker]
+name = "doubao"
+version = "0.1.0"
+description = "火山引擎豆包视觉理解 worker"
+config_version = "1.0"
+defaults = { method = "POST", timeout = 30.0, auth_required = false }
+
+[worker.registration]
+router_prefix = "/doubao"
+tags = ["vision", "ai"]