feat: initial bot implementation

src/config.js

@@ -0,0 +1,28 @@
+import dotenv from 'dotenv';
+import { fileURLToPath } from 'url';
+
+dotenv.config();
+
+const requiredEnv = ['DISCORD_TOKEN', 'OPENAI_API_KEY'];
+requiredEnv.forEach((key) => {
+  if (!process.env[key]) {
+    console.warn(`[config] Missing environment variable ${key}. Did you copy .env.example?`);
+  }
+});
+
+export const config = {
+  discordToken: process.env.DISCORD_TOKEN || '',
+  openAiKey: process.env.OPENAI_API_KEY || '',
+  chatModel: process.env.OPENAI_MODEL || 'gpt-4o-mini',
+  embedModel: process.env.OPENAI_EMBED_MODEL || 'text-embedding-3-small',
+  preferredChannel: process.env.BOT_CHANNEL_ID || null,
+  enableWebSearch: process.env.ENABLE_WEB_SEARCH !== 'false',
+  coderUserId: process.env.CODER_USER_ID || null,
+  maxCoderPingIntervalMs: 6 * 60 * 60 * 1000,
+  shortTermLimit: 10,
+  memoryFile: fileURLToPath(new URL('../data/memory.json', import.meta.url)),
+  summaryTriggerChars: 3000,
+  memoryPruneThreshold: 0.2,
+  maxMemories: 200,
+  relevantMemoryCount: 5,
+};