feat(web,contracts): implement PR Merge Validation for anti-fraud payout

packages/contracts/src/schemas/index.ts

@@ -169,6 +169,8 @@ export const SubmitSolutionRequestSchema = z.object({
   /** 接案時取得的冪等憑證，防止重複提交 */
   claim_token: z.string().uuid(),
   deliverables: z.record(z.string(), z.string()),
+  /** 必須在目標專案開啟 Pull Request，並提供該 PR 的網址以供人類審核 */
+  github_pr_url: z.string().url().optional(),
 });
 
 export const SubmitSolutionResponseSchema = z.object({