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
836 changed files with 165403 additions and 0 deletions
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+{
+  "id": "chatcmpl-fixed",
+  "type": "message",
+  "role": "assistant",
+  "content": [
+    {
+      "type": "text",
+      "text": "The answer is 42."
+    },
+    {
+      "type": "tool_use",
+      "id": "call_abc",
+      "name": "get_weather",
+      "input": {
+        "city": "Paris"
+      }
+    }
+  ],
+  "stop_reason": "tool_use",
+  "model": "gpt-test",
+  "usage": {
+    "input_tokens": 10,
+    "cache_creation_input_tokens": 0,
+    "cache_read_input_tokens": 3,
+    "output_tokens": 5,
+    "claude_cache_creation_5_m_tokens": 0,
+    "claude_cache_creation_1_h_tokens": 0,
+    "billing_usage": {
+      "source": "oai_chat",
+      "semantic": "openai",
+      "openai_usage": {
+        "prompt_tokens": 10,
+        "completion_tokens": 5,
+        "total_tokens": 15,
+        "prompt_tokens_details": {
+          "cached_tokens": 3,
+          "text_tokens": 0,
+          "audio_tokens": 0,
+          "image_tokens": 0
+        },
+        "completion_tokens_details": {
+          "text_tokens": 0,
+          "audio_tokens": 0,
+          "image_tokens": 0,
+          "reasoning_tokens": 2
+        },
+        "input_tokens": 0,
+        "output_tokens": 0,
+        "input_tokens_details": null,
+        "claude_cache_creation_5_m_tokens": 0,
+        "claude_cache_creation_1_h_tokens": 0
+      }
+    }
+  }
+}