Add full monorepo: virtual-banker, backend, frontend, docs, scripts, deployment

Co-authored-by: Cursor <cursoragent@cursor.com>

src/MockLinkToken.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.19;
+contract MockLinkToken {
+    string public name = "Chainlink Token";
+    string public symbol = "LINK";
+    uint8 public decimals = 18;
+    mapping(address => uint256) public balanceOf;
+    mapping(address => mapping(address => uint256)) public allowance;
+    uint256 public totalSupply;
+    event Transfer(address indexed from, address indexed to, uint256 value);
+    event Approval(address indexed owner, address indexed spender, uint256 value);
+    function mint(address to, uint256 amount) external {
+        balanceOf[to] += amount;
+        totalSupply += amount;
+        emit Transfer(address(0), to, amount);
+    }
+    function transfer(address to, uint256 amount) external returns (bool) {
+        require(balanceOf[msg.sender] >= amount, "insufficient balance");
+        balanceOf[msg.sender] -= amount;
+        balanceOf[to] += amount;
+        emit Transfer(msg.sender, to, amount);
+        return true;
+    }
+    function transferFrom(address from, address to, uint256 amount) external returns (bool) {
+        require(balanceOf[from] >= amount, "insufficient balance");
+        require(allowance[from][msg.sender] >= amount, "insufficient allowance");
+        balanceOf[from] -= amount;
+        balanceOf[to] += amount;
+        allowance[from][msg.sender] -= amount;
+        emit Transfer(from, to, amount);
+        return true;
+    }
+    function approve(address spender, uint256 amount) external returns (bool) {
+        allowance[msg.sender][spender] = amount;
+        emit Approval(msg.sender, spender, amount);
+        return true;
+    }
+}