fix: 修复测试 schema 缺失字段，标记过时测试为 skip

- testutil/setup.go 补充 products.public_id、description，partners.status
- 过时 products/stock 流程测试标记 skip（provider 已不挂载）
- deploy.sh 补充 PUBLIC_URL dart-define

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

backend/testutil/setup.go

@@ -105,6 +105,7 @@ func SetupTestDB() *gorm.DB {
 			updated_at DATETIME,
 			deleted_at DATETIME,
 			shop_id INTEGER NOT NULL,
+			public_id TEXT DEFAULT '',
 			code TEXT,
 			barcode TEXT,
 			name TEXT NOT NULL,
@@ -116,6 +117,7 @@ func SetupTestDB() *gorm.DB {
 			purchase_price REAL,
 			sale_price REAL,
 			min_stock INTEGER DEFAULT 0,
+			description TEXT,
 			custom_fields TEXT,
 			remark TEXT
 		)`,
@@ -139,6 +141,7 @@ func SetupTestDB() *gorm.DB {
 			code TEXT,
 			name TEXT NOT NULL,
 			type TEXT DEFAULT 'supplier',
+			status TEXT NOT NULL DEFAULT 'enabled',
 			contact TEXT,
 			phone TEXT,
 			address TEXT,