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/preload/index.d.ts

@@ -1,4 +1,29 @@
 // src/preload/index.d.ts
+export 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
+}
+
 export interface ElectronAPI {
   window: {
     minimize: () => void
@@ -14,6 +39,36 @@ export interface ElectronAPI {
     openFile: (options: { title?: string; filters?: { name: string; extensions: string[] }[] }) =>
       Promise<{ path: string; content: string } | null>
   }
+  credential: {
+    encrypt: (text: string) => Promise<string>
+    decrypt: (encoded: string) => Promise<string>
+  }
+  storage: {
+    getConnections: () => Promise<ConnectionConfig[]>
+    saveConnection: (conn: ConnectionConfig) => Promise<ConnectionConfig[]>
+    deleteConnection: (id: string) => Promise<ConnectionConfig[]>
+    reorderConnections: (ids: string[]) => Promise<ConnectionConfig[]>
+    getSettings: () => Promise<any>
+    saveSettings: (settings: any) => Promise<void>
+  }
+  redis: {
+    connect: (id: string, opts: any) => Promise<{ success: boolean; error?: string }>
+    disconnect: (id: string) => Promise<void>
+    execute: (id: string, command: string, args: string[]) => Promise<any>
+    getInfo: (id: string) => Promise<string>
+    scanKeys: (id: string, cursor: string, pattern: string, count: number) =>
+      Promise<{ cursor: string; keys: string[] }>
+    getKeyType: (id: string, key: string) => Promise<string>
+    getKeyTTL: (id: string, key: string) => Promise<number>
+    getString: (id: string, key: string) => Promise<string | null>
+    setString: (id: string, key: string, value: string) => Promise<void>
+    deleteKey: (id: string, key: string) => Promise<void>
+    hashScan: (id: string, key: string, cursor: string, count: number) =>
+      Promise<{ cursor: string; fields: [string, string][] }>
+    hashSet: (id: string, key: string, field: string, value: string) => Promise<void>
+    hashDel: (id: string, key: string, field: string) => Promise<void>
+    setTTL: (id: string, key: string, ttl: number) => Promise<void>
+  }
 }
 
 declare global {