feat(web+api): 贡献表单按 archive_kind 动态生成字段

- categories 接口返回 archive_kind
- 新增公开只读接口 /api/v1/kind-fields?kind=X 返回字段模板
- 投稿 payload 支持通用 attributes,审核通过写入 product.attributes (JSONB 合并)
- food_detail 仅在含食品数据时才 upsert (药品/3C/通用不再产生空行)
- 前端 Contribute 按所选品类 archive_kind 动态渲染字段
  (食品营养 / 药品 18 字段 / 3C / 通用),除商品名外均选填

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

public-frontend/src/types.ts

@@ -51,6 +51,20 @@ export interface Category {
   name_en: string | null;
   path: string;
   level: number;
+  archive_kind: string;
+}
+
+export interface KindField {
+  kind: string;
+  field_key: string;
+  group_label: string;
+  label_zh: string;
+  field_type: "text" | "number" | "textarea" | "select" | "list";
+  unit: string | null;
+  options: string[] | null;
+  placeholder: string | null;
+  sort_order: number;
+  qualified: boolean;
 }
 
 export interface SubmissionImage {
@@ -68,6 +82,7 @@ export interface SubmissionInput {
   country_of_origin?: string | null;
   ingredients_text?: string | null;
   nutriments?: Record<string, number> | null;
+  attributes?: Record<string, unknown> | null;
   nutrition_basis?: string | null;
   serving_size?: string | null;
   nutri_score?: string | null;