feat: IMAP mail sync with thread-to-contact matching (PRD §6.1)

Real IMAP connection via imapflow library:
- Connects to IMAP server (IMAPFlow, TLS on port 993)
- Fetches recent messages (configurable limit, default 20)
- Extracts: from, fromEmail, subject, date, snippet (200 chars)
- Thread-to-contact matching (PRD §6.1):
  1. Match sender email against persons table
  2. If no person match, extract domain and match against company.website
  3. Returns matchedCompany + matchedPerson for each email
- Audit-logged (action: crm.mailsync:imap)
- Zod validated (host, port, user, password, folder, limit)
- 502 on IMAP connection failure with detail
- 400 on validation failure

Tested: invalid creds → 502 'IMAP connection failed', missing host → 400

skills/TTS/tts.ts

@@ -0,0 +1,25 @@
+import ZAI from "z-ai-web-dev-sdk";
+import fs from "fs";
+
+async function main(text: string, outFile: string) {
+  try {
+    const zai = await ZAI.create();
+
+    const response = await zai.audio.tts.create({
+      input: text,
+      voice: "tongtong",
+      speed: 1.0,
+      response_format: "wav",
+      stream: false,
+    });
+
+    const arrayBuffer = await response.arrayBuffer();
+    const buffer = Buffer.from(new Uint8Array(arrayBuffer));
+    fs.writeFileSync(outFile, buffer);
+    console.log(`TTS audio saved to ${outFile}`);
+  } catch (err: any) {
+    console.error("TTS failed:", err?.message || err);
+  }
+}
+
+main("Hello, world!", "./output.wav");