refactor(B1): migrate to domain-driven project structure

Move all models/schemas/services/routers into app/domains/.
Keep backward-compat shims in old locations for imports.
Preserves domains/rendering/tasks.py from Phase A.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/domains/orders/schemas.py

@@ -0,0 +1,124 @@
+import uuid
+from datetime import datetime
+from typing import Any
+from pydantic import BaseModel
+from app.domains.orders.models import OrderStatus, ItemStatus, AIValidationStatus
+
+
+class ComponentData(BaseModel):
+    part_name: str | None = None
+    material: str | None = None
+    component_type: str | None = None
+    column_index: int | None = None
+
+
+class OrderItemCreate(BaseModel):
+    row_index: int
+    ebene1: str | None = None
+    ebene2: str | None = None
+    baureihe: str | None = None
+    pim_id: str | None = None
+    produkt_baureihe: str | None = None
+    gewaehltes_produkt: str | None = None
+    name_cad_modell: str | None = None
+    gewuenschte_bildnummer: str | None = None
+    lagertyp: str | None = None
+    medias_rendering: bool | None = None
+    components: list[ComponentData] = []
+
+
+class OrderItemOut(BaseModel):
+    id: uuid.UUID
+    order_id: uuid.UUID
+    row_index: int
+    ebene1: str | None
+    ebene2: str | None
+    baureihe: str | None
+    pim_id: str | None
+    produkt_baureihe: str | None
+    gewaehltes_produkt: str | None
+    name_cad_modell: str | None
+    gewuenschte_bildnummer: str | None
+    lagertyp: str | None
+    medias_rendering: bool | None
+    components: list[dict]
+    cad_file_id: uuid.UUID | None
+    thumbnail_path: str | None
+    cad_parsed_objects: list[str] | None = None
+    cad_part_materials: list[dict] = []
+    ai_validation_status: AIValidationStatus
+    ai_validation_result: dict | None
+    item_status: ItemStatus
+    notes: str | None
+    created_at: datetime
+
+    model_config = {"from_attributes": True}
+
+
+class OrderLineCreate(BaseModel):
+    product_id: uuid.UUID
+    output_type_id: uuid.UUID | None = None
+    render_position_id: uuid.UUID | None = None
+    gewuenschte_bildnummer: str | None = None
+    notes: str | None = None
+
+
+class OrderLineOut(BaseModel):
+    id: uuid.UUID
+    order_id: uuid.UUID
+    product_id: uuid.UUID
+    product: Any  # ProductOut — forward ref to avoid circular imports
+    output_type_id: uuid.UUID | None
+    output_type: Any | None  # OutputTypeOut
+    gewuenschte_bildnummer: str | None
+    item_status: str
+    render_status: str
+    result_path: str | None
+    thumbnail_url: str | None = None
+    ai_validation_status: str
+    ai_validation_result: dict | None
+    render_backend_used: str | None = None
+    flamenco_job_id: str | None = None
+    unit_price: float | None = None
+    render_position_id: uuid.UUID | None = None
+    render_position_name: str | None = None
+    notes: str | None
+    created_at: datetime
+    updated_at: datetime
+
+    model_config = {"from_attributes": True}
+
+
+class OrderCreate(BaseModel):
+    template_id: uuid.UUID | None = None
+    source_excel: str | None = None
+    notes: str | None = None
+    items: list[OrderItemCreate] = []
+    lines: list[OrderLineCreate] = []
+
+
+class OrderOut(BaseModel):
+    id: uuid.UUID
+    order_number: str
+    template_id: uuid.UUID | None
+    status: OrderStatus
+    created_by: uuid.UUID
+    source_excel: str | None
+    notes: str | None
+    created_at: datetime
+    updated_at: datetime
+    submitted_at: datetime | None = None
+    processing_started_at: datetime | None = None
+    completed_at: datetime | None = None
+    rejected_at: datetime | None = None
+    estimated_price: float | None = None
+    item_count: int = 0
+    line_count: int = 0
+    render_progress: dict | None = None
+
+    model_config = {"from_attributes": True}
+
+
+class OrderDetailOut(OrderOut):
+    items: list[OrderItemOut] = []
+    lines: list[OrderLineOut] = []