feat: 新增代理流水资产标识

openspec/changes/update-agent-fund-main-wallet-asset-link/tasks.md

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+## 1. Implementation
+
+- [x] 1.1 Add optional `asset_identifier` to `MainWalletTransactionItem`.
+- [x] 1.2 Add an "资产标识" column to the agent fund overview detail drawer's "预充值钱包流水" table.
+- [x] 1.3 Render `asset_identifier` as a clickable link when present and `-` when absent.
+- [x] 1.4 Navigate clicks to the asset information page using the clicked asset identifier as the search query.
+- [x] 1.5 Ensure the click does not trigger unrelated row/table interactions.
+
+## 2. Verification
+
+- [x] 2.1 Verify the changed Vue file with lint or equivalent available project checks.
+- [ ] 2.2 Manually verify rows with `asset_identifier` display and navigate correctly.
+- [ ] 2.3 Manually verify rows without `asset_identifier` display `-` and are not clickable.