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/admin/pool/schemas.py

@@ -0,0 +1,245 @@
+"""Pydantic schemas for Pool management API."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from pydantic import BaseModel, ConfigDict, Field
+
+from src.models.status_snapshot import ProviderKeyStatusSnapshotResponse
+
+# ---------------------------------------------------------------------------
+# Overview
+# ---------------------------------------------------------------------------
+
+
+class PoolOverviewItem(BaseModel):
+    """One Provider in the overview list."""
+
+    provider_id: str
+    provider_name: str
+    provider_type: str = "custom"
+    total_keys: int = 0
+    active_keys: int = 0
+    cooldown_count: int = 0
+    pool_enabled: bool = False
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class PoolOverviewResponse(BaseModel):
+    items: list[PoolOverviewItem] = Field(default_factory=list)
+
+
+# ---------------------------------------------------------------------------
+# Scheduling presets metadata
+# ---------------------------------------------------------------------------
+
+
+class PresetModeMetaResponse(BaseModel):
+    value: str
+    label: str
+
+
+class PresetDimensionMetaResponse(BaseModel):
+    name: str
+    label: str
+    description: str
+    providers: list[str] = Field(default_factory=list)
+    modes: list[PresetModeMetaResponse] | None = None
+    default_mode: str | None = None
+    mutex_group: str | None = None
+    evidence_hint: str | None = None
+
+
+# ---------------------------------------------------------------------------
+# Paginated key list
+# ---------------------------------------------------------------------------
+
+
+class PoolSchedulingReason(BaseModel):
+    """Structured scheduling reason for a key."""
+
+    code: str
+    label: str
+    blocking: bool = False
+    source: str = "pool"  # manual / pool / health / policy
+    ttl_seconds: int | None = None
+    detail: str | None = None
+
+
+class OAuthOrganizationSummary(BaseModel):
+    id: str | None = None
+    title: str | None = None
+    is_default: bool = False
+    role: str | None = None
+
+
+class PoolKeyDetail(BaseModel):
+    """Detailed status of a single pool key."""
+
+    key_id: str
+    key_name: str
+    is_active: bool
+    auth_type: str = "api_key"
+    oauth_expires_at: int | None = Field(
+        default=None, description="兼容字段；优先使用 status_snapshot.oauth"
+    )
+    oauth_invalid_at: int | None = Field(
+        default=None, description="兼容字段；优先使用 status_snapshot.oauth"
+    )
+    oauth_invalid_reason: str | None = Field(
+        default=None, description="兼容字段；优先使用 status_snapshot.oauth"
+    )
+    oauth_plan_type: str | None = None
+    oauth_account_id: str | None = None
+    oauth_account_name: str | None = None
+    oauth_account_user_id: str | None = None
+    oauth_organizations: list[OAuthOrganizationSummary] = Field(default_factory=list)
+    account_status_code: str | None = Field(
+        default=None, description="兼容字段；优先使用 status_snapshot.account"
+    )
+    account_status_label: str | None = Field(
+        default=None, description="兼容字段；优先使用 status_snapshot.account"
+    )
+    account_status_reason: str | None = Field(
+        default=None, description="兼容字段；优先使用 status_snapshot.account"
+    )
+    account_status_blocked: bool = Field(
+        default=False, description="兼容字段；优先使用 status_snapshot.account"
+    )
+    account_status_recoverable: bool = Field(
+        default=False, description="兼容字段；优先使用 status_snapshot.account"
+    )
+    account_status_source: str | None = Field(
+        default=None, description="兼容字段；优先使用 status_snapshot.account"
+    )
+    status_snapshot: ProviderKeyStatusSnapshotResponse = Field(
+        default_factory=ProviderKeyStatusSnapshotResponse,
+        description="统一的账号/OAuth/额度状态快照",
+    )
+    quota_updated_at: int | None = None
+    # 健康度聚合字段（与 Provider Key 列表口径一致）
+    health_score: float = 1.0
+    circuit_breaker_open: bool = False
+    # 编辑/权限/代理所需字段
+    api_formats: list[str] = Field(default_factory=list)
+    rate_multipliers: dict[str, float] | None = None
+    internal_priority: int = 50
+    rpm_limit: int | None = None
+    cache_ttl_minutes: int = 5
+    max_probe_interval_minutes: int = 32
+    note: str | None = None
+    allowed_models: list[str] | None = None
+    capabilities: dict[str, bool] | None = None
+    auto_fetch_models: bool = False
+    locked_models: list[str] | None = None
+    model_include_patterns: list[str] | None = None
+    model_exclude_patterns: list[str] | None = None
+    proxy: dict[str, Any] | None = None
+    fingerprint: dict[str, Any] | None = None
+    account_quota: str | None = None
+    cooldown_reason: str | None = None
+    cooldown_ttl_seconds: int | None = None
+    cost_window_usage: int = 0
+    cost_limit: int | None = None
+    request_count: int = 0
+    total_tokens: int = 0
+    total_cost_usd: str = "0.00000000"
+    sticky_sessions: int = 0
+    lru_score: float | None = None
+    created_at: str | None = None
+    last_used_at: str | None = None
+    scheduling_status: str = "available"  # available / degraded / blocked
+    scheduling_reason: str = "available"
+    scheduling_label: str = "可用"
+    scheduling_reasons: list[PoolSchedulingReason] = Field(default_factory=list)
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class PoolKeysPageResponse(BaseModel):
+    """Server-side paginated key list."""
+
+    total: int
+    page: int
+    page_size: int
+    keys: list[PoolKeyDetail] = Field(default_factory=list)
+
+
+# ---------------------------------------------------------------------------
+# Batch import
+# ---------------------------------------------------------------------------
+
+
+class PoolKeyImportItem(BaseModel):
+    """Single key to import."""
+
+    name: str
+    api_key: str
+    auth_type: str = "api_key"
+
+
+class BatchImportRequest(BaseModel):
+    keys: list[PoolKeyImportItem] = Field(..., max_length=500)
+    proxy_node_id: str | None = Field(
+        default=None,
+        description="导入时绑定到账号的代理节点 ID（可选）",
+    )
+
+
+class BatchImportError(BaseModel):
+    index: int
+    reason: str
+
+
+class BatchImportResponse(BaseModel):
+    imported: int = 0
+    skipped: int = 0
+    errors: list[BatchImportError] = Field(default_factory=list)
+
+
+# ---------------------------------------------------------------------------
+# Batch selection
+# ---------------------------------------------------------------------------
+
+
+class PoolKeySelectionRequest(BaseModel):
+    search: str = ""
+    quick_selectors: list[str] = Field(default_factory=list, max_length=10)
+
+
+class PoolKeySelectionItem(BaseModel):
+    key_id: str
+    key_name: str = ""
+    auth_type: str = "api_key"
+
+
+class PoolKeySelectionResponse(BaseModel):
+    total: int = 0
+    items: list[PoolKeySelectionItem] = Field(default_factory=list)
+
+
+# ---------------------------------------------------------------------------
+# Batch action
+# ---------------------------------------------------------------------------
+
+
+class BatchActionRequest(BaseModel):
+    key_ids: list[str] = Field(..., max_length=2000)
+    action: str  # enable / disable / delete / clear_cooldown / reset_cost / regenerate_fingerprint / clear_proxy / set_proxy
+    payload: dict[str, Any] | None = None
+
+
+class BatchActionResponse(BaseModel):
+    affected: int = 0
+    message: str = ""
+    task_id: str | None = None
+
+
+class BatchDeleteTaskResponse(BaseModel):
+    task_id: str
+    status: str  # pending / running / completed / failed
+    total: int = 0
+    deleted: int = 0
+    message: str = ""