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-<uuid>",
+  "model": "upstream-model",
+  "object": "chat.completion",
+  "created": 0,
+  "choices": [
+    {
+      "index": 0,
+      "message": {
+        "role": "assistant",
+        "content": "The answer is 42.",
+        "tool_calls": [
+          {
+            "id": "call_<uuid>",
+            "type": "function",
+            "function": {
+              "name": "get_weather",
+              "arguments": "{\"city\":\"Paris\"}"
+            }
+          }
+        ]
+      },
+      "finish_reason": "tool_calls"
+    }
+  ],
+  "usage": {
+    "prompt_tokens": 10,
+    "completion_tokens": 7,
+    "total_tokens": 15,
+    "billing_usage": {
+      "source": "gemini_chat",
+      "semantic": "gemini",
+      "gemini_usage_metadata": {
+        "promptTokenCount": 10,
+        "toolUsePromptTokenCount": 0,
+        "candidatesTokenCount": 5,
+        "totalTokenCount": 15,
+        "thoughtsTokenCount": 2,
+        "cachedContentTokenCount": 0,
+        "promptTokensDetails": [],
+        "toolUsePromptTokensDetails": [],
+        "candidatesTokensDetails": []
+      }
+    },
+    "prompt_tokens_details": {
+      "cached_tokens": 0,
+      "text_tokens": 10,
+      "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
+  }
+}