feat: split AI Input Agent into Copy/Type Agent submenu with settings

Renames the sidebar entry to "AI Copy/Type Agent" with Copy Agent, Type
Agent, and Settings sub-pages. Settings shows the server's LAN IP
address (via a new /api/ai/network-info endpoint) since it changes
depending on which office the app is running in.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/Backend/src/routes/ai-settings.ts

@@ -1,5 +1,6 @@
 import express, { Request, Response } from "express";
 import fs from "fs";
+import os from "os";
 import path from "path";
 import { storage } from "../storage";
 import { classifyInternalChat } from "../ai/internal-chat-graph";
@@ -14,6 +15,24 @@ function getChatHistoryPath(userId: number): string {
 
 const router = express.Router();
 
+// GET /api/ai/network-info — local LAN IP address(es) of this server
+router.get("/network-info", async (req: Request, res: Response): Promise<any> => {
+  try {
+    const interfaces = os.networkInterfaces();
+    const addresses: string[] = [];
+    for (const name of Object.keys(interfaces)) {
+      for (const iface of interfaces[name] ?? []) {
+        if (iface.family === "IPv4" && !iface.internal) {
+          addresses.push(iface.address);
+        }
+      }
+    }
+    return res.status(200).json({ ipAddress: addresses[0] ?? null, addresses });
+  } catch (err) {
+    return res.status(500).json({ error: "Failed to determine network info", details: String(err) });
+  }
+});
+
 // GET /api/ai/settings
 router.get("/settings", async (req: Request, res: Response): Promise<any> => {
   try {