Add Luxsin curve API client and validation functionality

- Introduced a new module `curve_client.py` for interacting with the Luxsin curve API, including functions for custom Base64 decoding and parametric EQ validation.
- Implemented error handling for API responses and validation checks for curve data.
- Removed outdated test files to streamline the codebase.
- Updated brand creation and update logic in `brands.py` to ensure brand names are validated and checked for duplicates.
- Enhanced model handling in `models.py` with new validation and push-to-search functionality, integrating curve validation before pushing to Meilisearch.
- Updated frontend components to support new validation and push processes, including user feedback for validation results and progress tracking.
- Changed favicon to SVG format for better scalability and appearance.

backend/routes/brands.py

@@ -65,14 +65,16 @@ def get_brand(brand_id: int, db: Session = Depends(get_db)):
 def create_brand(brand: BrandCreate, db: Session = Depends(get_db)):
     """创建新品牌"""
     try:
-        logger.info(f"Creating brand: name={brand.name}")
-        # 检查是否已存在
-        existing = db.query(Brand).filter(Brand.name == brand.name).first()
+        name = (brand.name or "").strip()
+        if not name:
+            return ApiResponse.error(msg="品牌名称不能为空", code=0)
+        logger.info(f"Creating brand: name={name}")
+        existing = db.query(Brand).filter(Brand.name == name).first()
         if existing:
-            logger.warning(f"Brand already exists: name={brand.name}")
+            logger.warning(f"Brand already exists: name={name}")
             return ApiResponse.error(msg="品牌名称已存在", code=0)
-        
-        db_brand = Brand(name=brand.name)
+
+        db_brand = Brand(name=name)
         db.add(db_brand)
         db.commit()
         db.refresh(db_brand)
@@ -88,19 +90,33 @@ def create_brand(brand: BrandCreate, db: Session = Depends(get_db)):
 def update_brand(brand_id: int, brand: BrandUpdate, db: Session = Depends(get_db)):
     """更新品牌"""
     try:
-        logger.info(f"Updating brand: id={brand_id}, data={brand.dict()}")
+        logger.info(f"Updating brand: id={brand_id}, data={brand.model_dump()}")
         db_brand = db.query(Brand).filter(Brand.id == brand_id).first()
         if not db_brand:
             logger.warning(f"Brand not found: id={brand_id}")
             return ApiResponse.no_data(msg="品牌不存在")
-        
-        # 如果更新名称，检查是否冲突
-        if brand.name and brand.name != db_brand.name:
-            existing = db.query(Brand).filter(Brand.name == brand.name).first()
+
+        if brand.name is None:
+            db.commit()
+            db.refresh(db_brand)
+            return ApiResponse.success(data=db_brand.to_dict(), msg="品牌更新成功")
+
+        new_name = brand.name.strip()
+        if not new_name:
+            return ApiResponse.error(msg="品牌名称不能为空", code=0)
+
+        current_name = (db_brand.name or "").strip()
+        if new_name != current_name:
+            # 排除当前记录；MySQL 大小写不敏感时，仅改大小写也会命中自身
+            existing = (
+                db.query(Brand)
+                .filter(Brand.name == new_name, Brand.id != brand_id)
+                .first()
+            )
             if existing:
-                logger.warning(f"Brand name already exists: name={brand.name}")
+                logger.warning(f"Brand name already exists: name={new_name}")
                 return ApiResponse.error(msg="品牌名称已存在", code=0)
-            db_brand.name = brand.name
+            db_brand.name = new_name
         
         db.commit()
         db.refresh(db_brand)