feat(models): 组织、用户、角色、客户、会话与消息模型

按组织边界定义数据关系，补齐仓储层与通用工具，迁移脚本可重复执行。

backend/app/models/schemas/workflow.py

@@ -0,0 +1,202 @@
+"""
+Copyright 2024-2026 ReplyPier
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+
+from pydantic import BaseModel, Field, validator
+from typing import Optional, List, Dict, Any, Union, Literal
+from uuid import UUID
+from datetime import datetime
+from app.models.workflow import WorkflowStatus
+from app.models.workflow_node import NodeType, ActionType
+
+
+# ==============================
+# Workflow schemas
+# ==============================
+
+class WorkflowBase(BaseModel):
+    name: str
+    description: Optional[str] = None
+    status: Optional[WorkflowStatus] = WorkflowStatus.DRAFT
+    is_template: bool = False
+    default_language: str = "en"
+    canvas_data: Dict[str, Any] = Field(default_factory=dict)
+    settings: Dict[str, Any] = Field(default_factory=dict)
+
+
+class WorkflowCreate(WorkflowBase):
+    agent_id: UUID
+
+
+# ==============================
+# Operation schemas for batch updates
+# ==============================
+
+class WorkflowNodeOperation(BaseModel):
+    operation: Literal["create", "update", "delete"]
+    id: Optional[UUID] = None  # Required for update/delete, optional for create
+    node_type: Optional[NodeType] = None
+    name: Optional[str] = None
+    description: Optional[str] = None
+    position_x: Optional[float] = None
+    position_y: Optional[float] = None
+    config: Optional[Dict[str, Any]] = None
+    
+    # Landing Page node fields
+    landing_page_heading: Optional[str] = None
+    landing_page_content: Optional[str] = None
+
+
+class WorkflowConnectionOperation(BaseModel):
+    operation: Literal["create", "update", "delete"]
+    id: Optional[UUID] = None  # Required for update/delete, optional for create
+    source_node_id: Optional[UUID] = None
+    target_node_id: Optional[UUID] = None
+    label: Optional[str] = None
+    condition: Optional[str] = None
+    priority: Optional[int] = None
+    connection_metadata: Optional[Dict[str, Any]] = None
+
+
+class WorkflowUpdate(BaseModel):
+    name: Optional[str] = None
+    description: Optional[str] = None
+    status: Optional[WorkflowStatus] = None
+    is_template: Optional[bool] = None
+    default_language: Optional[str] = None
+    canvas_data: Optional[Dict[str, Any]] = None
+    settings: Optional[Dict[str, Any]] = None
+    agent_id: Optional[UUID] = None
+    nodes: Optional[List[WorkflowNodeOperation]] = None
+    connections: Optional[List[WorkflowConnectionOperation]] = None
+
+
+class WorkflowResponse(WorkflowBase):
+    id: UUID
+    organization_id: UUID
+    agent_id: UUID
+    created_by: UUID
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        orm_mode = True
+
+
+# ==============================
+# WorkflowNode schemas
+# ==============================
+
+class WorkflowNodeBase(BaseModel):
+    workflow_id: UUID
+    node_type: NodeType
+    name: str
+    description: Optional[str] = None
+    position_x: float = 0
+    position_y: float = 0
+    config: Dict[str, Any] = Field(default_factory=dict)
+    
+    # Message node fields
+    message_text: Optional[str] = None
+    
+    # Condition node fields
+    condition_expression: Optional[str] = None
+    
+    # Action node fields
+    action_type: Optional[ActionType] = None
+    action_config: Optional[Dict[str, Any]] = None
+    
+    # Transfer node fields
+    transfer_rules: Optional[Dict[str, Any]] = None
+    
+    # Wait node fields
+    wait_duration: Optional[int] = None  # Duration in seconds
+    wait_until_condition: Optional[str] = None
+    
+    # Landing Page node fields
+    landing_page_heading: Optional[str] = None
+    landing_page_content: Optional[str] = None
+
+
+class WorkflowNodeCreate(WorkflowNodeBase):
+    pass
+
+
+class WorkflowNodeUpdate(BaseModel):
+    node_type: Optional[NodeType] = None
+    name: Optional[str] = None
+    description: Optional[str] = None
+    position_x: Optional[float] = None
+    position_y: Optional[float] = None
+    config: Optional[Dict[str, Any]] = None
+    
+    # Landing Page node fields
+    landing_page_heading: Optional[str] = None
+    landing_page_content: Optional[str] = None
+
+
+class WorkflowNodeResponse(WorkflowNodeBase):
+    id: UUID
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        orm_mode = True
+
+
+# ==============================
+# WorkflowConnection schemas
+# ==============================
+
+class WorkflowConnectionBase(BaseModel):
+    workflow_id: UUID
+    source_node_id: UUID
+    target_node_id: UUID
+    label: Optional[str] = None
+    condition: Optional[str] = None
+    priority: int = 0
+    connection_metadata: Dict[str, Any] = Field(default_factory=dict)
+
+
+class WorkflowConnectionCreate(WorkflowConnectionBase):
+    pass
+
+
+class WorkflowConnectionUpdate(BaseModel):
+    label: Optional[str] = None
+    condition: Optional[str] = None
+    priority: Optional[int] = None
+    connection_metadata: Optional[Dict[str, Any]] = None
+
+
+class WorkflowConnectionResponse(WorkflowConnectionBase):
+    id: UUID
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        orm_mode = True
+
+
+# ==============================
+# Additional composite schemas
+# ==============================
+
+class WorkflowDetailResponse(WorkflowResponse):
+    nodes: List[WorkflowNodeResponse]
+    connections: List[WorkflowConnectionResponse]
+
+    class Config:
+        orm_mode = True