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/stores/app.ts

@@ -0,0 +1,49 @@
+// src/renderer/src/stores/app.ts
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+
+export type ThemeMode = 'system' | 'dark' | 'light'
+
+export const useAppStore = defineStore('app', () => {
+  const theme = ref<ThemeMode>((localStorage.getItem('theme') as ThemeMode) || 'system')
+  const isDark = ref(true)
+  const fontSize = ref<number>(Number(localStorage.getItem('fontSize')) || 13)
+  const scanCount = ref<number>(Number(localStorage.getItem('scanCount')) || 100)
+
+  function applyTheme(mode: ThemeMode, osDark?: boolean) {
+    theme.value = mode
+    const dark = mode === 'system' ? (osDark ?? true) : mode === 'dark'
+    isDark.value = dark
+    document.documentElement.classList.toggle('light', !dark)
+  }
+
+  if (window.electronAPI) {
+    window.electronAPI.theme.onOsUpdated((osDark: boolean) => {
+      if (theme.value === 'system') {
+        applyTheme('system', osDark)
+      }
+    })
+  }
+
+  window.electronAPI?.theme.get().then((osDark: boolean) => {
+    applyTheme(theme.value, osDark)
+  })
+
+  function setTheme(mode: ThemeMode) {
+    applyTheme(mode)
+    localStorage.setItem('theme', mode)
+    window.electronAPI?.theme.set(mode)
+  }
+
+  function setFontSize(size: number) {
+    fontSize.value = size
+    localStorage.setItem('fontSize', String(size))
+  }
+
+  function setScanCount(count: number) {
+    scanCount.value = count
+    localStorage.setItem('scanCount', String(count))
+  }
+
+  return { theme, isDark, fontSize, scanCount, setTheme, setFontSize, setScanCount }
+})