feat: 算力引擎 Go 后端核心（new-api）

- 统一 OpenAI 兼容 /v1 中继 + 渠道/额度/令牌/流水 - 各领域包：relay 模型网关、model 数据层、controller 管理 API
2026-08-23 22:38:46 +08:00
commit 28e53d90fc
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+{
+  "model": "gpt-test",
+  "system": [
+    {
+      "type": "text",
+      "text": "You are a helpful assistant."
+    }
+  ],
+  "messages": [
+    {
+      "role": "user",
+      "content": [
+        {
+          "type": "text",
+          "text": "What is in this image?"
+        },
+        {
+          "type": "image",
+          "source": {
+            "type": "base64",
+            "media_type": "image/png",
+            "data": "aGVsbG8="
+          }
+        }
+      ]
+    },
+    {
+      "role": "assistant",
+      "content": [
+        {
+          "type": "tool_use",
+          "id": "call_abc",
+          "name": "get_weather",
+          "input": {
+            "city": "Paris"
+          }
+        }
+      ]
+    },
+    {
+      "role": "user",
+      "content": [
+        {
+          "type": "tool_result",
+          "content": "15 degrees",
+          "tool_use_id": "call_abc"
+        }
+      ]
+    }
+  ],
+  "max_tokens": 1024,
+  "stream": true,
+  "tools": [
+    {
+      "name": "get_weather",
+      "description": "Get weather by city",
+      "input_schema": {
+        "properties": {
+          "city": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "city"
+        ],
+        "type": "object"
+      }
+    }
+  ]
+}