refactor: restructure project layout

- Move main process to electron/main/
- Move preload to electron/preload/
- Add shared types in electron/shared/
- Split redis-service into modular redis/ directory
- Flatten renderer to src/ (remove src/renderer/ nesting)
- Update electron.vite.config.ts paths
- Update tsconfig paths
- Output to electron-dist/

src/components/Sidebar.vue

@@ -0,0 +1,79 @@
+<script setup lang="ts">
+// src/renderer/src/components/Sidebar.vue
+import { ref } from 'vue'
+import ConnectionList from './ConnectionList.vue'
+import NewConnectionDialog from './NewConnectionDialog.vue'
+import { useConnectionStore } from '@renderer/stores/connection'
+import { useKeyStore } from '@renderer/stores/key'
+import type { ConnectionConfig } from '@renderer/stores/connection'
+import { useKeyboard } from '@renderer/composables/useKeyboard'
+import { ElMessage, ElMessageBox } from 'element-plus'
+
+const connStore = useConnectionStore()
+const keyStore = useKeyStore()
+const dialogVisible = ref(false)
+const editingConnection = ref<ConnectionConfig | null>(null)
+
+function handleEdit(conn: ConnectionConfig | null) {
+  editingConnection.value = conn
+  dialogVisible.value = true
+}
+
+function handleNew() {
+  editingConnection.value = null
+  dialogVisible.value = true
+}
+
+async function deleteSelectedKey() {
+  if (!connStore.activeId || !keyStore.selectedKey) return
+  try {
+    await ElMessageBox.confirm(`Delete key "${keyStore.selectedKey}"?`, 'Confirm')
+    await window.electronAPI.redis.deleteKey(connStore.activeId, keyStore.selectedKey)
+    ElMessage.success('Deleted')
+    keyStore.selectedKey = null
+    keyStore.keyData = null
+    await keyStore.scanKeys(connStore.activeId, '0', true)
+  } catch { /* cancelled */ }
+}
+
+function deselectKey() {
+  keyStore.selectedKey = null
+  keyStore.keyData = null
+}
+
+function refreshAll() {
+  if (connStore.activeId) {
+    keyStore.scanKeys(connStore.activeId, '0', true)
+  }
+}
+
+useKeyboard({
+  'ctrl+n': handleNew,
+  'ctrl+r': refreshAll,
+  'f5': refreshAll,
+  'delete': deleteSelectedKey,
+  'escape': deselectKey,
+})
+</script>
+
+<template>
+  <aside class="sidebar">
+    <ConnectionList @edit="handleEdit" />
+    <NewConnectionDialog
+      v-model:visible="dialogVisible"
+      :connection="editingConnection"
+    />
+  </aside>
+</template>
+
+<style scoped>
+.sidebar {
+  width: 260px;
+  flex-shrink: 0;
+  background: var(--bg-secondary);
+  border-right: 1px solid var(--border-color);
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+</style>