refactor(paths): add @application path alias for main/core/application

Align with the existing @logger alias convention by introducing
@application as a short alias for src/main/core/application. This
reduces import verbosity across ~130 main-process files while keeping
4 intentional sub-path imports (@main/core/application/Application)
unchanged to preserve the vi.mock bypass mechanism in tests.

Configured in tsconfig.node.json and electron.vite.config.ts; Vitest
inherits the alias automatically.

Signed-off-by: fullex <0xfullex@gmail.com>

electron.vite.config.ts

@@ -34,6 +34,7 @@ export default defineConfig({
     resolve: {
       alias: {
         '@main': resolve('src/main'),
+        '@application': resolve('src/main/core/application'),
         '@types': resolve('src/renderer/src/types'),
         '@data': resolve('src/main/data'),
         '@shared': resolve('packages/shared'),