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/api/handlers/openai_cli/adapter.py

@@ -0,0 +1,138 @@
+"""
+OpenAI CLI Adapter - 基于通用 CLI Adapter 基类的简化实现
+
+继承 CliAdapterBase，只需配置 FORMAT_ID 和 HANDLER_CLASS。
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from src.api.base.context import ApiRequestContext
+from src.api.handlers.base.cli_adapter_base import CliAdapterBase, register_cli_adapter
+from src.api.handlers.base.cli_handler_base import CliMessageHandlerBase
+from src.config.settings import config
+from src.core.api_format import ApiFamily, EndpointKind
+from src.core.provider_types import ProviderType
+from src.utils.url_utils import is_codex_url
+
+
+@register_cli_adapter
+class OpenAICliAdapter(CliAdapterBase):
+    """
+    OpenAI CLI API 适配器
+
+    处理 /v1/responses 端点的请求。
+    """
+
+    FORMAT_ID = "openai:cli"
+    API_FAMILY = ApiFamily.OPENAI
+    name = "openai.cli"
+
+    @property
+    def HANDLER_CLASS(self) -> type[CliMessageHandlerBase]:
+        """延迟导入 Handler 类避免循环依赖"""
+        from src.api.handlers.openai_cli.handler import OpenAICliMessageHandler
+
+        return OpenAICliMessageHandler
+
+    def __init__(
+        self,
+        allowed_api_formats: list[str] | None = None,
+        *,
+        compact: bool = False,
+    ):
+        super().__init__(allowed_api_formats)
+        self._compact = compact
+
+    async def handle(self, context: ApiRequestContext) -> Any:
+        """处理 CLI API 请求。"""
+        if self._compact:
+            from src.services.provider.adapters.codex.context import (
+                CodexRequestContext,
+                set_codex_request_context,
+            )
+
+            # Keep compact routing state out of the request body. Transport/policy layers
+            # read this request-scoped flag directly when legacy compact fallback is needed.
+            set_codex_request_context(CodexRequestContext(is_compact=True))
+
+            body = await context.ensure_json_body_async()
+            # compact 端点永远非流式
+            body.pop("stream", None)
+        return await super().handle(context)
+
+    @classmethod
+    def build_endpoint_url(
+        cls,
+        base_url: str,
+        request_data: dict[str, Any],
+        model_name: str | None = None,
+        *,
+        compact: bool = False,
+        provider_type: str | None = None,
+    ) -> str:
+        """构建OpenAI CLI API端点URL（使用 Responses API）
+
+        对于 Codex OAuth 端点（如 chatgpt.com/backend-api/codex），直接追加 /responses；
+        对于标准 OpenAI API，使用 /v1/responses。
+        compact=True 时追加 /compact 后缀。
+
+        provider_type 优先：仅当 provider_type 为 codex 时才使用 Codex 路由规则；
+        未传入 provider_type 时回退到 URL 模式匹配（兼容旧调用方）。
+        """
+        suffix = "/responses/compact" if compact else "/responses"
+        base_url = base_url.rstrip("/")
+        # 判断是否按 Codex 规则构建 URL
+        is_codex = (
+            (provider_type or "").lower() == ProviderType.CODEX
+            if provider_type
+            else is_codex_url(base_url)
+        )
+        if is_codex:
+            return f"{base_url}{suffix}"
+        # 标准 OpenAI API
+        if base_url.endswith("/v1"):
+            return f"{base_url}{suffix}"
+        else:
+            return f"{base_url}/v1{suffix}"
+
+    # build_request_body 使用基类实现
+    # OpenAI CLI normalizer 会自动添加 instructions 字段
+
+    @classmethod
+    def build_request_body(
+        cls,
+        request_data: dict[str, Any] | None = None,
+        *,
+        base_url: str | None = None,
+        provider_type: str | None = None,
+    ) -> dict[str, Any]:
+        """构建测试请求体。"""
+        from src.api.handlers.base.request_builder import build_test_request_body
+
+        del base_url, provider_type
+        return build_test_request_body(cls.FORMAT_ID, request_data)
+
+    @classmethod
+    def get_cli_user_agent(cls) -> str | None:
+        """获取OpenAI CLI User-Agent"""
+        return config.internal_user_agent_openai_cli
+
+
+__all__ = ["OpenAICliAdapter"]
+
+
+@register_cli_adapter
+class OpenAICompactAdapter(OpenAICliAdapter):
+    """OpenAI Compact Responses adapter (/v1/responses/compact)."""
+
+    FORMAT_ID = "openai:compact"
+    ENDPOINT_KIND = EndpointKind.COMPACT
+    name = "openai.compact"
+
+    def __init__(self, allowed_api_formats: list[str] | None = None):
+        super().__init__(allowed_api_formats=allowed_api_formats, compact=True)
+
+
+__all__.append("OpenAICompactAdapter")