feat(config): add gmgn-cli config command for API Key onboarding

Add a new `gmgn-cli config` command that automates Ed25519 key pair
generation for new users. The command reuses an existing keypair.pem if
present, or generates a new one, then outputs a pre-filled API Key
creation link with the public key embedded. Guidance text is output in
the user's system locale (zh-CN, zh-TW, or English).

All 6 SKILL.md files are updated with a BEFORE RUNNING ANY COMMAND
block that detects missing GMGN_API_KEY, triggers gmgn-cli config, and
instructs the Agent to write both GMGN_API_KEY and GMGN_PRIVATE_KEY
into ~/.config/gmgn/.env once the user provides their API Key.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/commands/config.ts

@@ -0,0 +1,56 @@
+import { Command } from "commander";
+import * as crypto from "crypto";
+import * as fs from "fs";
+import * as path from "path";
+import * as os from "os";
+
+const GMGN_CONFIG_DIR = path.join(os.homedir(), ".config", "gmgn");
+const KEYPAIR_FILE = path.join(GMGN_CONFIG_DIR, "keypair.pem");
+const GMGN_API_URL = "https://gmgn.ai/ai/generateapi";
+
+export function registerConfigCommands(program: Command): void {
+  program
+    .command("config")
+    .description("Generate an Ed25519 key pair and output a pre-filled GMGN API Key creation link")
+    .action(async () => {
+      fs.mkdirSync(GMGN_CONFIG_DIR, { recursive: true });
+
+      let publicPem: string;
+
+      if (fs.existsSync(KEYPAIR_FILE)) {
+        // Reuse existing key pair
+        const content = fs.readFileSync(KEYPAIR_FILE, "utf-8");
+        const match = content.match(/(-----BEGIN PUBLIC KEY-----[\s\S]+?-----END PUBLIC KEY-----)/);
+        if (!match) {
+          console.error("Error: keypair.pem exists but public key could not be parsed. Delete ~/.config/gmgn/keypair.pem and try again.");
+          process.exit(1);
+        }
+        publicPem = match[1] + "\n";
+      } else {
+        // Generate new Ed25519 key pair
+        const { privateKey, publicKey } = crypto.generateKeyPairSync("ed25519");
+        const privatePem = privateKey.export({ type: "pkcs8", format: "pem" }) as string;
+        publicPem = publicKey.export({ type: "spki", format: "pem" }) as string;
+
+        const entry = `# Private Key\n${privatePem}\n# Public Key\n${publicPem}\n`;
+        fs.writeFileSync(KEYPAIR_FILE, entry, { mode: 0o600 });
+      }
+
+      const link = `${GMGN_API_URL}?pbk=${encodeURIComponent(publicPem)}`;
+
+      const locale = (process.env.LANG ?? process.env.LC_ALL ?? process.env.LC_MESSAGES ?? "").toLowerCase();
+      let message: string;
+      if (locale.startsWith("zh_tw") || locale.startsWith("zh_hk")) {
+        message = "請點擊連結建立你的 GMGN API Key，完成後將 Key 發給我，我來幫你完成配置：";
+      } else if (locale.startsWith("zh")) {
+        message = "请点击链接创建你的 GMGN API Key，完成后将 Key 发给我，我来帮你完成配置：";
+      } else {
+        message = "Please click the link below to create your GMGN API Key. Once created, send me the API Key and I will finish the configuration:";
+      }
+
+      console.log("");
+      console.log(message);
+      console.log(link);
+      console.log("");
+    });
+}

src/index.ts

@@ -11,6 +11,7 @@ import { registerPortfolioCommands } from "./commands/portfolio.js";
 import { registerTrackCommands } from "./commands/track.js";
 import { registerSwapCommands } from "./commands/swap.js";
 import { registerCookingCommands } from "./commands/cooking.js";
+import { registerConfigCommands } from "./commands/config.js";
 
 const proxy = process.env.HTTPS_PROXY ?? process.env.https_proxy
            ?? process.env.HTTP_PROXY  ?? process.env.http_proxy;
@@ -60,6 +61,7 @@ registerPortfolioCommands(program);
 registerTrackCommands(program);
 registerSwapCommands(program);
 registerCookingCommands(program);
+registerConfigCommands(program);
 
 program.parseAsync().catch((err) => {
   console.error(`[gmgn-cli] ${err.message}`);