🤖 Fix: Also use dynamic import for AIService module in IpcMain

The previous commit lazy-loaded AIService instance creation, but the
IpcMain module still had a static import of AIService at the top:
  import { AIService } from "@/services/aiService";

This meant that when loadServices() did await import("./services/ipcMain"),
it would immediately trigger loading of AIService module, which then
statically imports the massive "ai" package (~3s).

Fix: Change to type-only import and use require() in the getter.
This ensures the AI SDK is not loaded until AIService is first accessed.

Author: ammar-agent

src/services/ipcMain.ts

@@ -12,7 +12,7 @@ import {
   getMainWorktreeFromWorktree,
 } from "@/git";
 import { removeWorktreeSafe, removeWorktree, pruneWorktrees } from "@/services/gitService";
-import { AIService } from "@/services/aiService";
+import type { AIService } from "@/services/aiService";
 import { HistoryService } from "@/services/historyService";
 import { PartialService } from "@/services/partialService";
 import { AgentSession } from "@/services/agentSession";
@@ -69,9 +69,15 @@ export class IpcMain {
    */
   private get aiService(): AIService {
     if (!this._aiService) {
-      this._aiService = new AIService(this.config, this.historyService, this.partialService);
+      // Dynamic import to avoid loading AI SDK at startup
+      // This is safe because AIService is only accessed after IPC handlers are registered
+      /* eslint-disable-next-line @typescript-eslint/no-require-imports, no-restricted-syntax */
+      const { AIService: AIServiceClass } = require("@/services/aiService") as {
+        AIService: typeof AIService;
+      };
+      this._aiService = new AIServiceClass(this.config, this.historyService, this.partialService);
     }
-    return this._aiService;
+    return this._aiService!; // Non-null assertion safe: always initialized above
   }
 
   private getOrCreateSession(workspaceId: string): AgentSession {