init: 初始化 AssetX 项目仓库

包含 webapp（Next.js 用户端）、webapp-back（Go 后端）、
antdesign（管理后台）、landingpage（营销落地页）、
数据库 SQL 和配置文件。

webapp/lib/contracts/registry.ts

@@ -0,0 +1,30 @@
+/**
+ * Dynamic contract address registry.
+ * Populated from /api/contracts at runtime; falls back to static config.
+ * Module-level store — safe because addresses are the same across all renders.
+ */
+const dynamicRegistry = new Map<string, `0x${string}`>()
+
+export function setContractAddressDynamic(name: string, chainId: number, address: string) {
+  if (address && address.startsWith('0x')) {
+    dynamicRegistry.set(`${name}:${chainId}`, address as `0x${string}`)
+  }
+}
+
+export function getDynamicOverride(name: string, chainId: number): `0x${string}` | undefined {
+  return dynamicRegistry.get(`${name}:${chainId}`)
+}
+
+/**
+ * 按名称搜索，忽略 chainId（当 token 的 chainId=0 即 DB 未配置时使用）
+ * 返回第一个匹配的 { address, chainId }
+ */
+export function getDynamicOverrideByName(name: string): { address: `0x${string}`; chainId: number } | undefined {
+  for (const [key, value] of dynamicRegistry) {
+    if (key.startsWith(`${name}:`)) {
+      const chainId = parseInt(key.split(':')[1], 10)
+      return { address: value, chainId }
+    }
+  }
+  return undefined
+}