refactor: 移除 Python 后端源码，全面迁移至 Rust gateway 架构

- 删除全部 Python 源码 (src/) 及 Alembic 迁移脚本，归档至 _deprecated_py_src/
- 重构 Rust gateway ai_pipeline: 拆分 planner/finalize 模块，新增 contracts/adaptation 层
- 重组 handlers 模块为 admin/public/proxy/internal/shared 子模块结构
- 新增 executor 模块，引入 Rust 原生数据库迁移 (aether-data/migrations)
- 简化 CI/Docker 构建流程，移除 base image 二级构建，统一为单一 app image
- 移除 Python 相关基础设施文件 (entrypoint.sh, gunicorn_conf.py, Dockerfile.base)

_deprecated_py_src/plugins/token/base.py

@@ -0,0 +1,170 @@
+"""
+Token计数插件基类
+定义Token计数的接口
+"""
+
+from __future__ import annotations
+
+from abc import abstractmethod
+from dataclasses import dataclass
+from typing import Any
+
+from src.plugins.common import BasePlugin
+
+
+@dataclass
+class TokenUsage:
+    """令牌使用情况"""
+
+    input_tokens: int = 0
+    output_tokens: int = 0
+    total_tokens: int = 0
+    cache_read_tokens: int = 0  # Claude缓存读取
+    cache_write_tokens: int = 0  # Claude缓存写入
+    reasoning_tokens: int = 0  # OpenAI o1推理令牌
+
+    def __add__(self, other: TokenUsage) -> TokenUsage:
+        """令牌使用相加"""
+        return TokenUsage(
+            input_tokens=self.input_tokens + other.input_tokens,
+            output_tokens=self.output_tokens + other.output_tokens,
+            total_tokens=self.total_tokens + other.total_tokens,
+            cache_read_tokens=self.cache_read_tokens + other.cache_read_tokens,
+            cache_write_tokens=self.cache_write_tokens + other.cache_write_tokens,
+            reasoning_tokens=self.reasoning_tokens + other.reasoning_tokens,
+        )
+
+    def to_dict(self) -> dict[str, int]:
+        """转换为字典"""
+        return {
+            "input_tokens": self.input_tokens,
+            "output_tokens": self.output_tokens,
+            "total_tokens": self.total_tokens,
+            "cache_read_tokens": self.cache_read_tokens,
+            "cache_write_tokens": self.cache_write_tokens,
+            "reasoning_tokens": self.reasoning_tokens,
+        }
+
+
+class TokenCounterPlugin(BasePlugin):
+    """
+    Token计数插件基类
+    支持不同模型的Token计数
+    """
+
+    def __init__(self, name: str = "token_counter", config: dict[str, Any] | None = None):
+        # 调用父类初始化，设置metadata
+        super().__init__(
+            name=name, config=config, description="Token Counter Plugin", version="1.0.0"
+        )
+
+        self.supported_models = self.config.get("supported_models", [])
+        self.default_model = self.config.get("default_model")
+
+    @abstractmethod
+    def supports_model(self, model: str) -> bool:
+        """检查是否支持指定模型"""
+        pass
+
+    @abstractmethod
+    async def count_tokens(self, text: str, model: str | None = None) -> int:
+        """计算文本的Token数量"""
+        pass
+
+    @abstractmethod
+    async def count_messages(self, messages: list[dict[str, Any]], model: str | None = None) -> int:
+        """计算消息列表的Token数量"""
+        pass
+
+    async def count_request(self, request: dict[str, Any], model: str | None = None) -> int:
+        """计算请求的Token数量"""
+        model = model or request.get("model") or self.default_model
+        messages = request.get("messages", [])
+        return await self.count_messages(messages, model)
+
+    async def count_response(
+        self, response: dict[str, Any], model: str | None = None
+    ) -> TokenUsage:
+        """从响应中提取Token使用情况"""
+        usage = response.get("usage", {})
+
+        # OpenAI格式
+        if "prompt_tokens" in usage:
+            return TokenUsage(
+                input_tokens=usage.get("prompt_tokens", 0),
+                output_tokens=usage.get("completion_tokens", 0),
+                total_tokens=usage.get("total_tokens", 0),
+                reasoning_tokens=usage.get("completion_tokens_details", {}).get(
+                    "reasoning_tokens", 0
+                ),
+            )
+
+        # Claude格式
+        elif "input_tokens" in usage:
+            return TokenUsage(
+                input_tokens=usage.get("input_tokens", 0),
+                output_tokens=usage.get("output_tokens", 0),
+                total_tokens=usage.get("input_tokens", 0) + usage.get("output_tokens", 0),
+                cache_read_tokens=usage.get("cache_read_input_tokens", 0),
+                cache_write_tokens=usage.get("cache_creation_input_tokens", 0),
+            )
+
+        return TokenUsage()
+
+    async def estimate_cost(
+        self, usage: TokenUsage, model: str, provider: str | None = None
+    ) -> dict[str, float]:
+        """估算使用成本"""
+        # 默认价格表（每1M tokens的价格）
+        pricing = self.config.get("pricing", {})
+
+        # 获取模型价格
+        model_pricing = pricing.get(model, {})
+        if not model_pricing:
+            # 尝试使用前缀匹配
+            for model_prefix, price_info in pricing.items():
+                if model.startswith(model_prefix):
+                    model_pricing = price_info
+                    break
+
+        if not model_pricing:
+            return {"error": "No pricing information available"}
+
+        # 计算成本
+        input_cost = (usage.input_tokens / 1_000_000) * model_pricing.get("input", 0)
+        output_cost = (usage.output_tokens / 1_000_000) * model_pricing.get("output", 0)
+
+        # 缓存成本（Claude特有）
+        cache_read_cost = (usage.cache_read_tokens / 1_000_000) * model_pricing.get("cache_read", 0)
+        cache_write_cost = (usage.cache_write_tokens / 1_000_000) * model_pricing.get(
+            "cache_write", 0
+        )
+
+        # 推理成本（OpenAI o1特有）
+        reasoning_cost = (usage.reasoning_tokens / 1_000_000) * model_pricing.get("reasoning", 0)
+
+        total_cost = input_cost + output_cost + cache_read_cost + cache_write_cost + reasoning_cost
+
+        return {
+            "input_cost": round(input_cost, 6),
+            "output_cost": round(output_cost, 6),
+            "cache_read_cost": round(cache_read_cost, 6),
+            "cache_write_cost": round(cache_write_cost, 6),
+            "reasoning_cost": round(reasoning_cost, 6),
+            "total_cost": round(total_cost, 6),
+            "currency": "USD",
+        }
+
+    @abstractmethod
+    async def get_model_info(self, model: str) -> dict[str, Any]:
+        """获取模型信息"""
+        pass
+
+    async def get_stats(self) -> dict[str, Any]:
+        """获取统计信息"""
+        return {
+            "type": self.name,
+            "enabled": self.enabled,
+            "supported_models": self.supported_models,
+            "default_model": self.default_model,
+        }