feat: Add zap command for sending Bitcoin Lightning tips

- Implemented the `zap` command in the CLI to allow users to send sats to a user, event, or snippet using a NIP-60 wallet.
- Created a new `zap.ts` file to handle the command logic and integrated it into the MCP server.
- Added wallet balance command to check the balance of a user's wallet.
- Enhanced the MCP server to register the new zap command and wallet balance command.
- Introduced caching for wallets to optimize performance and reduce redundant network requests.
- Updated database schema to include snippets table for storing code snippets.
- Improved logging functionality for better debugging and tracking of operations.
- Added functionality to save snippets to the database upon retrieval.
- Updated project overview documentation to reflect new features and structure.
- Refactored existing commands and logic for better modularity and maintainability.

logic/create-pubkey.ts

@@ -1,9 +1,12 @@
 import NDK, { NDKPrivateKeySigner, NDKUser, NDKEvent } from "@nostr-dev-kit/ndk";
+import { NDKCashuWallet } from "@nostr-dev-kit/ndk-wallet";
+import { NDKCashuMintList } from "@nostr-dev-kit/ndk";
+import { getWallet } from "../lib/cache/wallets.js";
 import { z } from "zod";
 import { getUser, saveUser } from "../config.js";
 import { log } from "../lib/utils/log.js";
 import { ndk } from "../ndk.js";
-import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import type { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
 
 export async function createPubkey({
     username,
@@ -44,6 +47,27 @@ export async function createPubkey({
         // Publish the event
         await event.publish();
 
+
+        // --- Setup Cashu Wallet (NIP-60/NIP-61) ---
+        log(`Setting up Cashu wallet for ${username}...`);
+
+        try {
+            // Use getWallet to retrieve or create a wallet for the new pubkey
+            const wallet = await getWallet(signer.pubkey);
+            
+            if (wallet) {
+                log(`Cashu wallet setup complete for ${username}.`);
+                log(` -> P2PK: ${wallet.p2pk}`);
+                log(` -> Mints: ${wallet.mints.join(', ')}`);
+            } else {
+                throw new Error("Failed to create wallet");
+            }
+        } catch (walletError) {
+            console.error(`Failed to set up Cashu wallet for ${username}:`, walletError);
+            // Decide if this should be a fatal error for pubkey creation
+            // For now, log the error and continue
+        }
+        // --- End Cashu Wallet Setup ---
         // Save the user to the config
         saveUser(username, {
             nsec: signer.privateKey,
@@ -59,7 +83,7 @@ export async function createPubkey({
 
         return {
             user,
-            message: `Created pubkey for ${username} with npub ${user.npub}`,
+            message: `Created pubkey for ${username} with npub ${user.npub} and a NIP-60 Cashu wallet for nutzaps`,
         };
     } catch (error: unknown) {
         const errorMessage =