feat: Discord + Instagram integrations

Discord Bot API
- New client: src/clients/discord.ts
- Tools: discord_get_me, discord_get_guilds, discord_get_channels, discord_send_message, discord_get_messages
- REST endpoints: GET /api/discord/me, /api/discord/guilds, /api/discord/channels, /api/discord/messages, POST /api/discord/message
- Multi-account env var: DISCORD_{ACCOUNT}_BOT_TOKEN

Instagram Graph API
- New client: src/clients/instagram.ts
- Tools: instagram_get_profile, instagram_get_media, instagram_create_post
- REST endpoints: GET /api/instagram/profile, /api/instagram/media, POST /api/instagram/post
- Multi-account env vars: INSTAGRAM_{ACCOUNT}_ACCESS_TOKEN, INSTAGRAM_{ACCOUNT}_BUSINESS_ACCOUNT_ID

Total tools: 32

src/clients/instagram.ts

@@ -0,0 +1,139 @@
+const INSTAGRAM_API_BASE = 'https://graph.facebook.com/v18.0';
+
+function getAccessToken(account: string): string {
+  const envKey = `INSTAGRAM_${account.toUpperCase()}_ACCESS_TOKEN`;
+  return process.env[envKey] ?? '';
+}
+
+function getBusinessAccountId(account: string): string {
+  const envKey = `INSTAGRAM_${account.toUpperCase()}_BUSINESS_ACCOUNT_ID`;
+  return process.env[envKey] ?? '';
+}
+
+async function instagramRequest(
+  endpoint: string,
+  accessToken: string,
+  method: 'GET' | 'POST' = 'GET',
+  params?: Record<string, unknown>
+) {
+  const url = new URL(`${INSTAGRAM_API_BASE}${endpoint}`);
+  url.searchParams.set('access_token', accessToken);
+
+  const res = await fetch(url.toString(), {
+    method,
+    headers: params ? { 'Content-Type': 'application/json' } : undefined,
+    body: params ? JSON.stringify(params) : undefined,
+    signal: AbortSignal.timeout(15000),
+  });
+
+  if (!res.ok) {
+    const error = await res.text();
+    throw new Error(`Instagram API error (${res.status}): ${error}`);
+  }
+
+  return res.json();
+}
+
+export async function getProfile(args: { account?: string }): Promise<{
+  id: string;
+  username: string;
+  name: string;
+  followers_count: number;
+  follows_count: number;
+  media_count: number;
+}> {
+  const accessToken = getAccessToken(args.account ?? 'default');
+  const businessAccountId = getBusinessAccountId(args.account ?? 'default');
+
+  if (!accessToken || !businessAccountId) {
+    throw new Error('Missing Instagram credentials. Set INSTAGRAM_{ACCOUNT}_ACCESS_TOKEN and INSTAGRAM_{ACCOUNT}_BUSINESS_ACCOUNT_ID');
+  }
+
+  const data = await instagramRequest(
+    `/${businessAccountId}?fields=username,name,followers_count,follows_count,media_count`,
+    accessToken
+  );
+
+  return {
+    id: data.id,
+    username: data.username ?? '',
+    name: data.name ?? '',
+    followers_count: data.followers_count ?? 0,
+    follows_count: data.follows_count ?? 0,
+    media_count: data.media_count ?? 0,
+  };
+}
+
+export async function getMedia(args: { limit?: number; account?: string }): Promise<Array<{
+  id: string;
+  caption?: string;
+  media_type: string;
+  media_url?: string;
+  permalink?: string;
+  timestamp?: string;
+}>> {
+  const accessToken = getAccessToken(args.account ?? 'default');
+  const businessAccountId = getBusinessAccountId(args.account ?? 'default');
+
+  if (!accessToken || !businessAccountId) {
+    throw new Error('Missing Instagram credentials. Set INSTAGRAM_{ACCOUNT}_ACCESS_TOKEN and INSTAGRAM_{ACCOUNT}_BUSINESS_ACCOUNT_ID');
+  }
+
+  const limit = args.limit ?? 10;
+  const data = await instagramRequest(
+    `/${businessAccountId}/media?fields=id,caption,media_type,media_url,permalink,timestamp&limit=${limit}`,
+    accessToken
+  );
+
+  return (data.data ?? []).map((item: { id: string; caption?: string; media_type: string; media_url?: string; permalink?: string; timestamp?: string }) => ({
+    id: item.id,
+    caption: item.caption,
+    media_type: item.media_type,
+    media_url: item.media_url,
+    permalink: item.permalink,
+    timestamp: item.timestamp,
+  }));
+}
+
+export async function createPost(args: {
+  image_url: string;
+  caption?: string;
+  account?: string;
+}): Promise<{ success: boolean; media_id: string }> {
+  const accessToken = getAccessToken(args.account ?? 'default');
+  const businessAccountId = getBusinessAccountId(args.account ?? 'default');
+
+  if (!accessToken || !businessAccountId) {
+    throw new Error('Missing Instagram credentials. Set INSTAGRAM_{ACCOUNT}_ACCESS_TOKEN and INSTAGRAM_{ACCOUNT}_BUSINESS_ACCOUNT_ID');
+  }
+
+  // Step 1: Create media container
+  const container = await instagramRequest(
+    `/${businessAccountId}/media`,
+    accessToken,
+    'POST',
+    {
+      image_url: args.image_url,
+      caption: args.caption,
+      media_type: 'REELS',
+    }
+  );
+
+  const creationId = container.id;
+  if (!creationId) {
+    throw new Error('Failed to create Instagram media container');
+  }
+
+  // Step 2: Publish the container
+  const publish = await instagramRequest(
+    `/${businessAccountId}/media_publish`,
+    accessToken,
+    'POST',
+    { creation_id: creationId }
+  );
+
+  return {
+    success: true,
+    media_id: publish.id,
+  };
+}