feat(dashboard): scaffold SvelteKit SPA for control plane

SvelteKit 2 + Svelte 5 (runes) + TS, built with `adapter-static`
into a single SPA bundle that Caddy serves verbatim in production.
The dashboard targets only `/api/admin/*` (manager); data-plane
invocations go through the orchestrator, not through here.

  * Vite dev server proxies `/api` and `/healthz` to PICLOUD_API
    (default `http://127.0.0.1:18080` to match the picloud bind
    override). Port configurable via PICLOUD_DASHBOARD_PORT.
  * `src/lib/api.ts` is a thin typed client over the control-plane
    paths; the scripts placeholder route shows the "load → error →
    list" shape so the missing-API state is informative, not blank.
  * SSR disabled at the layout level: the build is a pure SPA, no
    Node runtime is required at serve time.
  * `npm run check` and `npm run build` both green; `npm audit`
    clean (cookie override pins past the SvelteKit transitive
    advisory that doesn't apply in SPA mode).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

dashboard/eslint.config.js

@@ -0,0 +1,32 @@
+import prettier from 'eslint-config-prettier';
+import js from '@eslint/js';
+import svelte from 'eslint-plugin-svelte';
+import globals from 'globals';
+import ts from 'typescript-eslint';
+
+export default ts.config(
+	js.configs.recommended,
+	...ts.configs.recommended,
+	...svelte.configs['flat/recommended'],
+	prettier,
+	...svelte.configs['flat/prettier'],
+	{
+		languageOptions: {
+			globals: {
+				...globals.browser,
+				...globals.node
+			}
+		}
+	},
+	{
+		files: ['**/*.svelte'],
+		languageOptions: {
+			parserOptions: {
+				parser: ts.parser
+			}
+		}
+	},
+	{
+		ignores: ['build/', '.svelte-kit/', 'dist/']
+	}
+);