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/

tsconfig.web.json

@@ -11,8 +11,9 @@
     "composite": true,
     "baseUrl": ".",
     "paths": {
-      "@renderer/*": ["src/renderer/src/*"]
+      "@renderer/*": ["src/*"],
+      "@shared/*": ["electron/shared/*"]
     }
   },
-  "include": ["src/renderer/**/*", "src/renderer/src/**/*.d.ts", "src/preload/index.d.ts"]
+  "include": ["src/**/*", "electron/preload/index.d.ts"]
 }