refactor(types): move shared types from renderer to shared directory

- Move type definitions from src/renderer/src/types/ to src/shared/types/
- Add @shared/* path alias to tsconfig.node.json and tsconfig.web.json
- Update all imports from @renderer/types/* to @shared/types/*
- Update AGENTS.md with new directory structure and path alias

This fixes architecture violation where main/preload processes imported
from renderer directory. Types are now properly shared across all processes.

src/preload/index.d.ts

@@ -14,15 +14,15 @@ import type {
   DownloadResult,
   GetVersionsParams,
   RollbackParams,
-} from "@renderer/types/ipc";
-import type { Domain, DomainWithStatus } from "@renderer/types/domain";
+} from "@shared/types/ipc";
+import type { Domain, DomainWithStatus } from "@shared/types/domain";
 import type {
   KintoneSpace,
   KintoneApp,
   AppDetail,
   FileContent,
-} from "@renderer/types/kintone";
-import type { Version } from "@renderer/types/version";
+} from "@shared/types/kintone";
+import type { Version } from "@shared/types/version";
 
 declare global {
   interface Window {