refactor(server): 移除鉴权并归档遗留路由至 legacy/

- 删除 auth.py 与 deps.py，各路由去除 get_current_user 依赖
- collection.py 更名为 materials.py，冻结链路（ozon/publish/shops/categories）移入 legacy/
- 扩展默认生图服务端口并入 8800 并自动迁移旧配置，水印默认文案改为 Panda Store
- 新增 docs/v2.1/backend-structure.md 后端结构盘点文档

server/api/products.py

@@ -8,7 +8,6 @@ from sqlalchemy import select, func
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from db import get_db
-from deps import get_current_user
 from models import Product, ProductAsset
 from models.enums import Stage
 from schemas.product import ProductDetail, ProductListItem, ProductUpdate
@@ -22,8 +21,7 @@ async def list_products(
     q: str | None = None,
     page: int = Query(1, ge=1),
     page_size: int = Query(20, ge=1, le=100),
-    db: AsyncSession = Depends(get_db),
-    _user: dict = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db)
 ):
     stmt = select(Product)
     if stage:
@@ -42,8 +40,7 @@ async def list_products(
 @router.get("/{product_id}", response_model=ProductDetail)
 async def get_product(
     product_id: str,
-    db: AsyncSession = Depends(get_db),
-    _user: dict = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db)
 ):
     product = await db.get(Product, UUID(product_id))
     if product is None:
@@ -54,8 +51,7 @@ async def get_product(
 @router.post("", response_model=ProductDetail)
 async def create_product(
     body: ProductUpdate,
-    db: AsyncSession = Depends(get_db),
-    _user: dict = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db)
 ):
     product = Product(stage=Stage.collected)
     _apply_update(product, body)
@@ -68,8 +64,7 @@ async def create_product(
 @router.post("/{product_id}/copy", response_model=ProductDetail)
 async def copy_product(
     product_id: str,
-    db: AsyncSession = Depends(get_db),
-    _user: dict = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db)
 ):
     """复制商品为新变体：继承标题/描述/属性/型号名称/计价，重置货号与图片。"""
     src = await db.get(Product, UUID(product_id))
@@ -118,8 +113,7 @@ async def copy_product(
 async def update_product(
     product_id: str,
     body: ProductUpdate,
-    db: AsyncSession = Depends(get_db),
-    _user: dict = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db)
 ):
     product = await db.get(Product, UUID(product_id))
     if product is None:
@@ -134,8 +128,7 @@ async def update_product(
 async def delete_product(
     product_id: str,
     hard: bool = False,
-    db: AsyncSession = Depends(get_db),
-    _user: dict = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db)
 ):
     product = await db.get(Product, UUID(product_id))
     if product is None:
@@ -151,8 +144,7 @@ async def delete_product(
 @router.get("/{product_id}/assets")
 async def list_assets(
     product_id: str,
-    db: AsyncSession = Depends(get_db),
-    _user: dict = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db)
 ):
     rows = (await db.scalars(
         select(ProductAsset)