feat(core): scaffold account manager platform

apps/discord-bot/README.md

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+# Discord bot
+
+The bot will provide ephemeral `/register` and `/account` responses containing short-lived one-time links. The target guild is read from admin-managed application settings rather than a deployment-only environment variable.
+
+Implementation begins in Phase 2 alongside the one-time login service.

apps/discord-bot/package.json

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+{
+  "name": "@minecraft-account-manager/discord-bot",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@minecraft-account-manager/contracts": "*",
+    "discord.js": "^14.25.1"
+  },
+  "devDependencies": {
+    "typescript": "^5.9.3"
+  }
+}

apps/discord-bot/src/index.ts

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+// Discord command handling is added in Phase 2 after the one-time login service exists.
+export {};

apps/discord-bot/tsconfig.json

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+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "types": ["node"]
+  },
+  "include": ["src/**/*.ts"]
+}