feat: 移除PDI和订单号字段，新增设备巡检模块

- 从物料跟踪页面移除订单号列和表单字段
- 从导航菜单移除PDI管理，添加设备巡检
- 新增InspectionLocation和InspectionRecord后端模型和API
- 新增设备巡检前端页面（左侧点位列表，右侧设备和历史记录）

backend/app/config.py

@@ -0,0 +1,29 @@
+from pydantic_settings import BaseSettings
+from typing import List
+import json
+
+
+class Settings(BaseSettings):
+    DATABASE_URL: str = "postgresql+asyncpg://postgres:password@localhost:5432/pickling_mes"
+    DATABASE_SYNC_URL: str = "postgresql://postgres:password@localhost:5432/pickling_mes"
+    REDIS_URL: str = "redis://localhost:6379/0"
+
+    SECRET_KEY: str = "dev-secret-key"
+    ALGORITHM: str = "HS256"
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 480
+
+    APP_HOST: str = "0.0.0.0"
+    APP_PORT: int = 8000
+    DEBUG: bool = True
+
+    L1_HOST: str = "0.0.0.0"
+    L1_PORT: int = 9000
+
+    CORS_ORIGINS: List[str] = ["http://localhost:8080", "http://127.0.0.1:8080"]
+
+    class Config:
+        env_file = ".env"
+        env_file_encoding = "utf-8"
+
+
+settings = Settings()