feat(phase2): connection management

- RedisService in main process (ioredis wrapper, execute, scan, hash ops)
- electron-store for connection/settings persistence
- safeStorage credential encrypt/decrypt
- IPC handlers for redis, storage, credential channels
- Preload API typed with all new channels
- useConnectionStore (Pinia) with connect/disconnect/save/delete
- ConnectionCard with 3D hover effect + status indicator
- ConnectionList with search filter
- NewConnectionDialog (create/edit connection form)
- Sidebar component
- StatusBar with live connection status + pulse animation
- App.vue updated with Sidebar layout

src/main/store.ts

@@ -0,0 +1,55 @@
+// src/main/store.ts
+import Store from 'electron-store'
+
+interface ConnectionConfig {
+  id: string
+  name: string
+  host: string
+  port: number
+  auth: string
+  username: string
+  tls: boolean
+  tlsCaPath: string
+  tlsCertPath: string
+  tlsKeyPath: string
+  sshEnabled: boolean
+  sshHost: string
+  sshPort: number
+  sshUsername: string
+  sshPassword: string
+  sshPrivateKeyPath: string
+  cluster: boolean
+  sentinelMasterName: string
+  separator: string
+  order: number
+  createdAt: number
+  color?: string
+}
+
+interface AppSettings {
+  theme: 'system' | 'dark' | 'light'
+  locale: string
+  fontSize: number
+  scanCount: number
+}
+
+interface AppStorage {
+  connections: ConnectionConfig[]
+  settings: AppSettings
+}
+
+const store = new Store<AppStorage>({
+  name: 'jrdm-config',
+  defaults: {
+    connections: [],
+    settings: {
+      theme: 'system',
+      locale: 'en',
+      fontSize: 13,
+      scanCount: 500,
+    },
+  },
+})
+
+export default store
+export type { ConnectionConfig, AppSettings }