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-back/lending/routers.go

@@ -0,0 +1,14 @@
+package lending
+
+// Routing is now handled in main.go
+// All lending routes are registered directly in main.go:
+//
+// GET  /api/lending/position/:address       - Get user lending position
+// GET  /api/lending/stats                   - Get lending market statistics
+// GET  /api/lending/markets                 - Get lending markets configuration
+// POST /api/lending/supply                  - Supply USDC
+// POST /api/lending/withdraw                - Withdraw USDC
+// POST /api/lending/supply-collateral       - Supply collateral (YT tokens)
+// POST /api/lending/withdraw-collateral     - Withdraw collateral
+// POST /api/lending/borrow                  - Borrow USDC
+// POST /api/lending/repay                   - Repay USDC