CHORE: Migrate launcher from Vue CLI to electron-vite

[NeoPlays]

Replaces the unmaintained @vue/cli-service + vue-cli-plugin-electron-builder (abandoned alpha) build stack with electron-vite (Vite 7), and fixes the issues the switch surfaced.

• Build: electron.vite.config.js builds main/preload/renderer; electron-builder.config.cjs packages it (signing/notarization preserved). Moved index.html to root, added postcss.config.js, updated background.js (dev/prod URL handling + app:// protocol), updated the release CI workflow, removed vue.config.js.
• Bug fixes exposed by the stricter bundler: renamed LoginPage.vue.vue, fixed double-slash image paths, declared missing runtime deps (uuid, js-yaml, events), converted renderer require()s to ESM imports.
• Control-tab crash + empty widgets: caused by eval() in the monitoring code that broke under bundler variable renaming, replaced with direct lookups and guarded the affected store accesses.
• CSP: added a Content-Security-Policy (no unsafe-eval); removed all runtime eval/new Function (replaced vue3-circle-progress with an inline SVG, used JSON5.parse for devnet input, enabled Vue-I18n JIT).
• Dependencies: npm audit 12 vulnerabilities → 0 via safe minor/patch bumps; no breaking majors.