fix: bugs, lint errors, dead code, and dev tools exposure

[t0kubetsu]

Summary

• Fixes a runtime 404 caused by a double slash in the Proxmox network node list API endpoint (/network//node/list → /network/node/list)
• Resolves a Pinia store ID collision: proxmoxSettingsStore.ts and useProxmoxSettings.js both registered under 'proxmoxSettings'; the TS store is now 'proxmoxSettingsV1'
• Replaces the stale scaffold unit test (always-failing 'You did it!' assertion) with a real App mount smoke test
• Removes 30+ unused variable declarations and imports across ProjectEditor.vue, Dashboard.vue, ConfigPanel.vue, Sidebar.vue, App.vue, and several TS composables
• Adds defineOptions multi-word names to Settings, Dashboard, and Sidebar components to satisfy vue/multi-word-component-names
• Gates vite-plugin-vue-devtools on mode === 'development' so it is no longer bundled into production builds
• Renames package.json "name" from the scaffolding placeholder "vue-project" to "range42-deployer-ui"
• Adds typescript-eslint with TypeScript parser for Vue SFCs so .ts files and <script lang="ts"> blocks are properly linted; updates vitest.config.js to handle the function-form vite config

Closes #44, #45, #46, #47, #48, #49, #52

Test plan

• npm run lint passes with 0 errors
• npm run test:unit -- --run passes (1/1)
• npm run build completes successfully
• Confirm vite-plugin-vue-devtools is not present in the production dist/