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/claude_cli/adapter.py

@@ -0,0 +1,105 @@
+"""
+Claude 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.handlers.base.cli_adapter_base import CliAdapterBase, register_cli_adapter
+from src.api.handlers.base.cli_handler_base import CliMessageHandlerBase
+from src.api.handlers.claude.adapter import ClaudeCapabilityDetector
+from src.config.settings import config
+from src.core.api_format import ApiFamily
+
+
+@register_cli_adapter
+class ClaudeCliAdapter(CliAdapterBase):
+    """
+    Claude CLI API 适配器
+
+    处理 Claude CLI 格式的请求（/v1/messages 端点，使用 Bearer 认证）。
+    """
+
+    FORMAT_ID = "claude:cli"
+    API_FAMILY = ApiFamily.CLAUDE
+    name = "claude.cli"
+
+    @property
+    def HANDLER_CLASS(self) -> type[CliMessageHandlerBase]:
+        """延迟导入 Handler 类避免循环依赖"""
+        from src.api.handlers.claude_cli.handler import ClaudeCliMessageHandler
+
+        return ClaudeCliMessageHandler
+
+    def __init__(self, allowed_api_formats: list[str] | None = None):
+        super().__init__(allowed_api_formats)
+
+    def detect_capability_requirements(
+        self,
+        headers: dict[str, str],
+        request_body: dict[str, Any] | None = None,
+    ) -> dict[str, bool]:
+        """检测 Claude CLI 请求中隐含的能力需求"""
+        return ClaudeCapabilityDetector.detect_from_headers(headers, request_body)
+
+    def _extract_message_count(self, payload: dict[str, Any]) -> int:
+        """Claude CLI 使用 messages 字段"""
+        messages = payload.get("messages", [])
+        return len(messages) if isinstance(messages, list) else 0
+
+    def _build_audit_metadata(
+        self,
+        payload: dict[str, Any],
+        path_params: dict[str, Any] | None = None,  # noqa: ARG002
+    ) -> dict[str, Any]:
+        """Claude CLI 特定的审计元数据"""
+        model = payload.get("model", "unknown")
+        stream = payload.get("stream", False)
+        messages = payload.get("messages", [])
+
+        role_counts = {}
+        for msg in messages:
+            role = msg.get("role", "unknown")
+            role_counts[role] = role_counts.get(role, 0) + 1
+
+        return {
+            "action": "claude_cli_request",
+            "model": model,
+            "stream": bool(stream),
+            "max_tokens": payload.get("max_tokens"),
+            "messages_count": len(messages),
+            "message_roles": role_counts,
+            "temperature": payload.get("temperature"),
+            "top_p": payload.get("top_p"),
+            "tool_count": len(payload.get("tools") or []),
+            "system_present": bool(payload.get("system")),
+        }
+
+    @classmethod
+    def build_endpoint_url(
+        cls,
+        base_url: str,
+        request_data: dict[str, Any],
+        model_name: str | None = None,
+        *,
+        provider_type: str | None = None,
+    ) -> str:
+        """构建Claude CLI API端点URL"""
+        base_url = base_url.rstrip("/")
+        if base_url.endswith("/v1"):
+            return f"{base_url}/messages"
+        else:
+            return f"{base_url}/v1/messages"
+
+    # build_request_body 使用基类实现，通过 format_conversion_registry 自动转换 OPENAI -> CLAUDE_CLI
+
+    @classmethod
+    def get_cli_user_agent(cls) -> str | None:
+        """获取Claude CLI User-Agent"""
+        return config.internal_user_agent_claude_cli
+
+
+__all__ = ["ClaudeCliAdapter"]