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/App.vue

@@ -0,0 +1,41 @@
+<script setup lang="ts">
+// src/renderer/src/App.vue
+import { onMounted } from 'vue'
+import TitleBar from './components/TitleBar.vue'
+import Sidebar from './components/Sidebar.vue'
+import MainArea from './components/MainArea.vue'
+import StatusBar from './components/StatusBar.vue'
+import { useConnectionStore } from '@renderer/stores/connection'
+
+const connStore = useConnectionStore()
+
+onMounted(() => {
+  connStore.loadConnections()
+})
+</script>
+
+<template>
+  <div class="app-shell">
+    <TitleBar />
+    <div class="app-body">
+      <Sidebar />
+      <MainArea />
+    </div>
+    <StatusBar />
+  </div>
+</template>
+
+<style scoped>
+.app-shell {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+  width: 100%;
+}
+
+.app-body {
+  flex: 1;
+  display: flex;
+  overflow: hidden;
+}
+</style>