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/main/ipc-handlers.ts

@@ -11,16 +11,13 @@ import {
   getDomain,
   deleteDomain,
   listDomains,
-  saveVersion,
   listVersions,
   deleteVersion,
   saveDownload,
   saveBackup,
-  isSecureStorageAvailable,
-  getStorageBackend,
 } from "./storage";
-import { KintoneClient, KintoneError } from "./kintone-api";
-import type { Result } from "@renderer/types/ipc";
+import { KintoneClient, createKintoneClient } from "./kintone-api";
+import type { Result } from "@shared/types/ipc";
 import type {
   CreateDomainParams,
   UpdateDomainParams,
@@ -35,13 +32,13 @@ 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, DomainWithPassword } from "@shared/types/domain";
 import type {
   Version,
   DownloadMetadata,
   BackupMetadata,
-} from "@renderer/types/version";
+} from "@shared/types/version";
 
 // Cache for Kintone clients
 const clientCache = new Map<string, KintoneClient>();
@@ -59,7 +56,7 @@ async function getClient(domainId: string): Promise<KintoneClient> {
     throw new Error(`Domain not found: ${domainId}`);
   }
 
-  const client = new KintoneClient(domainWithPassword);
+  const client = createKintoneClient(domainWithPassword);
   clientCache.set(domainId, client);
   return client;
 }
@@ -196,7 +193,7 @@ function registerTestConnection(): void {
       throw new Error(`Domain not found: ${id}`);
     }
 
-    const client = new KintoneClient(domainWithPassword);
+    const client = createKintoneClient(domainWithPassword);
     const result = await client.testConnection();
 
     return {
@@ -226,7 +223,7 @@ function registerTestDomainConnection(): void {
         updatedAt: new Date().toISOString(),
       };
 
-      const client = new KintoneClient(tempDomain);
+      const client = createKintoneClient(tempDomain);
       const result = await client.testConnection();
 
       if (!result.success) {