feat: 前端平台规则页面支持文档上传 + AI 解析

- 新增前端类型定义 (ParsedRulesData, BrandPlatformRuleResponse 等)
- 新增 4 个 API 方法 (parsePlatformRule, confirmPlatformRule, listBrandPlatformRules, deletePlatformRule)
- 重写品牌方规则页面平台规则 tab，支持文档上传→AI解析→确认/编辑→生效流程
- 保留违禁词/竞品/白名单三个 tab 原有功能
- 支持 USE_MOCK 双模式

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

frontend/types/rules.ts

@@ -79,6 +79,54 @@ export interface PlatformListResponse {
   total: number
 }
 
+// ===== 品牌方平台规则（文档上传 + AI 解析） =====
+
+export interface ParsedRulesData {
+  forbidden_words: string[]
+  restricted_words: { word: string; condition: string; suggestion: string }[]
+  duration: { min_seconds?: number; max_seconds?: number } | null
+  content_requirements: string[]
+  other_rules: { rule: string; description: string }[]
+}
+
+export interface PlatformRuleParseRequest {
+  document_url: string
+  document_name: string
+  platform: string
+  brand_id: string
+}
+
+export interface PlatformRuleParseResponse {
+  id: string
+  platform: string
+  brand_id: string
+  document_url: string
+  document_name: string
+  parsed_rules: ParsedRulesData
+  status: string
+}
+
+export interface PlatformRuleConfirmRequest {
+  parsed_rules: ParsedRulesData
+}
+
+export interface BrandPlatformRuleResponse {
+  id: string
+  platform: string
+  brand_id: string
+  document_url: string
+  document_name: string
+  parsed_rules: ParsedRulesData
+  status: string  // draft / active / inactive
+  created_at: string
+  updated_at: string
+}
+
+export interface BrandPlatformRuleListResponse {
+  items: BrandPlatformRuleResponse[]
+  total: number
+}
+
 // ===== 规则冲突检测 =====
 
 export interface RuleValidateRequest {